LET Reviewer in BIOLOGICAL SCIENCE Part 5

<div class="bluebox"> Majorship LET Reviewer</div> <br /> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://2.bp.blogspot.com/-jotbPLN52TA/VQwi0OwAPRI/AAAAAAAABKo/GROSlNICFOw/s1600/mcqs-biology.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="LET Reviewer for Biological Science" border="0" src="http://2.bp.blogspot.com/-jotbPLN52TA/VQwi0OwAPRI/AAAAAAAABKo/GROSlNICFOw/s1600/mcqs-biology.jpg" title="LET Reviewer for Biological Science" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">LET Reviewer for Biological Science</td></tr> </tbody></table> <b>PRACTICE TEST</b><b> IN BIOLOGICAL SCIENCE</b><br /> <br /> 51. Which hormone is insufficient in cretinism?<br /> A. Glucagon<br /> B. Adrenalin<br /> C. Insulin<br /> D. Thyroxine<br /> <br /> 52. Which of the following is both endocrine and an exocrine gland?<br /> A. Gastric glands<br /> B. Thyroid glands<br /> C. Pituitary glands<br /> D. Pancreas<br /> <br /> 53. What organ is controlled by the automatic nervous system?<br /> A. Skeletal<br /> B. Muscles<br /> C. Heart<br /> D. Both A and B<br /> <br /> 54. What do you call food in a semi-liquid form, partially digested and mixed with hydrochloric acid?<br /> A. Gastric secretion<br /> B. Gastric fluid<br /> C. Mucosa<br /> D. Chime<br /> <br /> 55. Which is considered the master gland due to its influence on the activity of all the other glands?<br /> A. Thyroid<br /> B. Adrenal<br /> C. Pituitary<br /> D. Parathyroid<br /> <br /> 56. Which part of the brain is responsible for intelligence, memory and learned behavior?<br /> A. Cerebellum<br /> B. Cerebrum<br /> C. Medulla<br /> D. Thalamus<br /> <br /> 57. Which of these materials is not a major component of the plasma membrane?<br /> A. Phospholipids<br /> B. Glycoprotein<br /> C. Proteins<br /> D. DNA<br /> <br /> 58. Which form of RNA delivers information from DNA to be used in making protein?<br /> A. Messenger RNA<br /> B. Ribosomal RNA<br /> C. Transfer RNA<br /> D. All of the above<br /> <br /> 59. Which of the following is not a type of cell?<br /> A. Bacterium<br /> B. Amoeba<br /> C. Sperm<br /> D. Virus<br /> <br /> 60. Which property of water is probably MOST important for the functioning of organisms at the molecular level?<br /> A. Cohesion and high surface tension<br /> B. High specific heat<br /> C. High heat of vaporization<br /> D. Versatility as a solvent<br /> <br /> 61. Which of the following statements is true of diffusion?<br /> A. It requires an expenditure of energy by the cell<br /> B. It is a passive process<br /> C. It occurs when molecules move from a region of lower concentration to one of higher concentration<br /> D. It requires a membrane<br /> <br /> 62. Which of the following is FALSE in comparing prophase I of meiosis and prophase of mitosis?<br /> A. The chromosomes condense in both<br /> B. Tetrads form in both<br /> C. The nuclear envelope disassembles in both<br /> D. A spindle forms in both<br /> <br /> 63. Which are small, irregularly-shaped cells without nuclei but are rich in ATP?<br /> A. Leukocytes<br /> B. Thrombocytes<br /> C. Lymphocytes<br /> D. Erythrocytes<br /> <br /> 64. What branch of Biology is involved when one is studying the characteristic structure and functions of all kinds of cells?<br /> A. Cytology<br /> B. Morphology<br /> C. Physiology<br /> D. Histology<br /> <br /> 65. Which part of seed appears as a scar which marks the entry of the pollen tube during fertilization?<br /> A. Seed leaf<br /> B. Cotyledon<br /> C. Testa<br /> D. Hilum<br /> <br /> 66. Which type of tissue is responsible for the secondary growth in stems and roots of vascular plants?<br /> A. Meristematic cells<br /> B. Cambium<br /> C. Palisade layer<br /> D. Epidermis<br /> <br /> 67. Which biome grows tropical grassland with scattered individual trees and larger herbivores?<br /> A. Tundra<br /> B. Rain forest<br /> C. Grassland<br /> D. Savanna<br /> <br /> 68. What do you call that process in birds wherein they shed off features at least once a year?<br /> A. Skinning<br /> B. Molting<br /> C. Furrowing<br /> D. Migrating<br /> <br /> 69. What chemical controls metamorphosis among insects?<br /> A. Enzymes<br /> B. Estradol<br /> C. Pheromones<br /> D. Ethylene<br /> <br /> 70. Which of the following makes up the plant cell wall?<br /> A. Nucleic acid<br /> B. Cellulose<br /> C. Protein<br /> D. Lipids<br /> <br /> 71. Which of the following is not true of fungi?<br /> A. Some are pathogenic<br /> B. Some are photosynthetic<br /> C. Some are edible<br /> D. Form symbiotic relation with algae<br /> <br /> 72. Which of the following is not true of plants?<br /> A. Some are pathogenic<br /> B. Some are photosynthetic<br /> C. Some are edible<br /> D. Form symbiotic relation with algae<br /> <br /> 73. Which of the following is considered multi-cellular?<br /> A. Embryo<br /> B. Fertilized egg<br /> C. Egg cell<br /> D. Sperm cell<br /> <br /> 74. What hormone promotes the growth of the uterine lining for the implantation of the embryo?<br /> A. Lactogenic hormone<br /> B. Progesterone<br /> C. Testosterone<br /> D. Oxytocen<br /> <br /> 75. Which of the following pair of organisms are closely related?<br /> A. Spider and mosquito<br /> B. Frog and crocodile<br /> C. Man and monkey<br /> D. Ants and aphids<br /> <br /> 76. What does it mean if the blood pressure of human is 110/70?<br /> A. The systolic pressure is 70<br /> B. The diastolic pressure is 70<br /> C. The pulse rate is 110 beats per minute<br /> D. Both B and C<br /> <br /> 77. Which of the following happens when man exhale?<br /> A. The residual volume of the lungs decreases<br /> B. The diaphragm contracts<br /> C. The volume of the thoracic cavity decreases<br /> D. The lung contracts<br /> <br /> 78. Which of the following regulate breathing?<br /> A. RBC concentration<br /> B. Number of haemoglobin<br /> C. Hormone level in blood<br /> D. CO2 and O2 concentration and pH level sensors<br /> <br /> 79. Which of the following has the lowest velocity of blood flow<br /> A. Veins<br /> B. Arteries<br /> C. Capillaries<br /> D. Arterioles<br /> <br /> 80. How many carbon atoms can each pyruvic acid supply into the Kirb’s cycle?<br /> A. 8<br /> B. 6<br /> C. 4<br /> D. 2<br /> <br /> 81.How many oxygen is required each time to a molecule of glucose is completely oxidized through aerobic respiration?<br /> A. 3<br /> B. 6<br /> C. 12<br /> D. 24<br /> <br /> 82. Which of the following will not be accepted by glycolysis for catabolism?<br /> A. Starch<br /> B. Glycerol<br /> C. Fatty acid<br /> D. Sucrose<br /> <br /> 83. Which of the following characteristic is common between echinoderms and cnidarians?<br /> A. They are both radically symmetrical<br /> B. They have segmented bodies<br /> C. Both have stinging cells<br /> D. They have three embryonic tissue layers<br /> <br /> 84. Which of the following is true of Phylum Chordata?<br /> 1-Presence of notochord that provides skeletal support<br /> 2-Pharyngeal slits that have become modified for gas exchange<br /> 3-Dorsal hallow nerve cord that develops into the central nervous system<br /> A. 2 and 3<br /> B. 1 and 2<br /> C. 1 and 3<br /> D. 1, 2 and 3<br /> <br /> 85. Which of the following cannot be associated with fungi?<br /> A. Absorptive nutrition<br /> B. Decomposers<br /> C. Autotrophs<br /> D. Spore production<br /> <br /> 86. Which of the following does not involve mitosis?<br /> A. Development of embryo<br /> B. Growth<br /> C. Production of gametes<br /> D. Repairing of damaged tissues<br /> <br /> 87. Which of the followings is true of mammals?<br /> 1-They have four chambered heart<br /> 2-They produce milk for the young<br /> 3-They are warm blooded<br /> A. 1 and 2<br /> B. 2 and 3<br /> C. 1 and 3<br /> D. 1, 2 and 3<br /> <br /> 88. What term describes an egg develop into a new organism without itself being fertilized be a sperm?<br /> A. Regeneration<br /> B. Conjugation<br /> C. Parthenogenesis<br /> D. Fusion<br /> <br /> 89. Which of the following is responsible for formation of blood cell?<br /> A. Cartilage<br /> B. Bone narrow<br /> C. Joints<br /> D. Tendons<br /> <br /> 90. What is most likely happen when a species cannot adapt to the changes in the environment?<br /> A. It will be transform to another form<br /> B. It will become extinct<br /> C. It will be isolated<br /> D. It will grow old<br /> <br /> 91. What term is used to describe the released of matured egg cell from the ovary?<br /> A. Fertilization<br /> B. Copulation<br /> C. Ovulation<br /> D. Germination<br /> <br /> 92. Which of the following blood cells is responsible for blood clotting?<br /> A. Erythrocytes<br /> B. Leukocytes<br /> C. Thrombocytes<br /> D. Neutrophils<br /> <br /> 93. Where does ectopic pregnancy occur?<br /> A. Uterus<br /> B. Ovary<br /> C. Cervix<br /> D. Fallopian tube<br /> <br /> 94. Why is cell membrane semi permeability important?<br /> A. It is important in determining the size of the cell<br /> B. It controls the kind of substances that enters and leaves the cell<br /> C. It controls the pressure and energy gradient<br /> D. It allows the molecules to diffuse freely in and out of the cell<br /> <br /> 95. What theory of evolution accounts for snake’s disappearance of legs and development of giraffe’s long neck?<br /> A. Theory of use and disuse<br /> B. Theory of natural selection<br /> C. Theory of chromosomal change<br /> D. Theory of action and interaction<br /> <br /> 96. Which of the following is an exocrine gland?<br /> A. Plastids and pigments<br /> B. Asters and centrioles<br /> C. Chloroplasts and vacuoles<br /> D. Cell wall and cell membrane<br /> <br /> 97. Which of the following is an exocrine gland?<br /> A. Thyroid gland<br /> B. Salivary gland<br /> C. Pituitary gland<br /> D. Adrenal gland<br /> <br /> 98. Which of the following is not an accessory organ of digestion?<br /> A. Liver<br /> B. Pancreas<br /> C. Salivary gland<br /> D. Adrenal gland<br /> <br /> 99. What hormone stimulates the development of male secondary sex characteristics?<br /> A. Estrogen<br /> B. Prolactin<br /> C. Testosterone<br /> D. Progesteron<br /> <br /> 100. Which of the following parts performs both as reproductive and urinary functions in males?<br /> A. Ureter<br /> B. Testes<br /> C. Urethra<br /> D. Scrotum<br /> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://adf.ly/1F5mNX" target="_blank"><img alt="Biological Science" border="0" src="http://2.bp.blogspot.com/-_PFABbawQHQ/VA0kf6_YvjI/AAAAAAAAAZI/9qzE0TiS5Qs/s1600/dl.png" /></a></div>

LET Reviewer in BIOLOGICAL SCIENCE Part 5

Majorship LET Reviewer LET Reviewer for Biological Science PRACTICE TEST  IN BIOLOGICAL SCIENCE 51. Which hormone is insufficient i...

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LET Reviewer in BIOLOGICAL SCIENCE Part 4

<div class="bluebox"> Majorship LET Reviewer</div> <br /> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://2.bp.blogspot.com/-jotbPLN52TA/VQwi0OwAPRI/AAAAAAAABKo/GROSlNICFOw/s1600/mcqs-biology.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="LET Reviewer for Biological Science" border="0" src="http://2.bp.blogspot.com/-jotbPLN52TA/VQwi0OwAPRI/AAAAAAAABKo/GROSlNICFOw/s1600/mcqs-biology.jpg" title="LET Reviewer for Biological Science" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">LET Reviewer for Biological Science</td></tr> </tbody></table> <b>PRACTICE TEST</b><b> IN BIOLOGICAL SCIENCE</b><br /> <br /> 1. Where do producers obtain their energy?<br /> A. From other producers<br /> B. From the consumers<br /> C. From the decomposers<br /> D. From the sun<br /> <br /> 2. Why do you experience not seeing things clearly for some seconds when you enter suddenly a well-lighted room after coming from a dark room, you?<br /> A. The pupils are not adapted to the dark<br /> B. The eyes are adapted to the light only<br /> C. The pupils are not dilated yet<br /> D. Light had caused temporary blindness<br /> <br /> 3. What term is used to describe the ability to maintain a constant internal environment?<br /> A. Metabolism<br /> B. Growth and development<br /> C. Homeostasis<br /> D. Thermoregulation<br /> <br /> 4. What is the most common cause of cardiovascular disease?<br /> A. Fatty deposits in the arteries<br /> B. Inadequate supply of red blood cells<br /> C. Lack of sodium in the diet<br /> D. Increased heartbeat<br /> <br /> 5. Which is the smallest unit of life that can survive and reproduce on its own?<br /> A. Cell<br /> B. Organ<br /> C. Tissues<br /> D. Population<br /> <br /> 6. Which region of a vertebrate forebrain is considered with the neutral-endocrine control of visceral activities?<br /> A. Cerebellum<br /> B. Thalamus<br /> C. Hypothalamus<br /> D. Pituitary<br /> <br /> 7. Which of the following is the building block carbohydrate?<br /> A. Amino acid<br /> B. Nucleotide<br /> C. Fatty acid<br /> D. Monosaccharide<br /> <br /> 8. Why it is necessary men have more red blood cells per cubic millimeter of blood than women?<br /> A. Man does strenuous activities and need more energy<br /> B. They have bigger physique and need more blood<br /> C. Man waste more blood cells and need extra<br /> D. They are more prone to anemia disorders<br /> <br /> 9. Which of the following is the building block of protein?<br /> A. Amino acid<br /> B. Nucleotide<br /> C. Fatty acid<br /> D. Monosaccharide<br /> <br /> 10. Where does protein synthesis take place?<br /> A. Ribosomes<br /> B. Lysosomes<br /> C. Endoplasmic reticulum<br /> D. Golgi bodies<br /> <br /> 11. Why are our lips “redder” than our palm?<br /> A. There is increased blood flow in the lips<br /> B. Lips are heavily keratinized<br /> C. Lip epidermis is thinner<br /> D. Many blood vessels are located around the lips<br /> <br /> 12. Which of the following cannot be found in prokaryotes?<br /> A. Cytoplasm<br /> B. Plasma membrane<br /> C. Membrane-bound nucleus<br /> D. DNA<br /> <br /> 13. What do we call mutation that is brought about by the earth natural radioactivity?<br /> A. Continuous<br /> B. Induced<br /> C. Lysosomes<br /> D. Chloroplast<br /> <br /> 14. Which of the following organelles produces turbo pressure against cell wall and mainly acts as water reservoir<br /> A. Plastids<br /> B. Vacuole<br /> C. Lysosomes<br /> D. Chloroplast<br /> <br /> 15. What is the branch crobial organisms is used in the creation of genetically modified organisms?<br /> A. Pseudomonas vulgaris<br /> B. Bacillus thuringensis<br /> C. Agro bacterium tumafaciens<br /> D. Escherichia coli<br /> <br /> 16. What is the branch of zoology that is devoted to the study of fish?<br /> A. Helmintology<br /> B. Ichthyology<br /> C. Chondrichthyes<br /> D. Ornithology<br /> <br /> 17.The process involved in the production of mRNA using DNA as template is termed _______?<br /> A. Transcription<br /> B. Replication<br /> C. Gene manipulation<br /> D. Reverse transcription<br /> <br /> 18. What is the most abundant inorganic compound in the protoplasm?<br /> A. Fluid<br /> B. Blood<br /> C. Plasma<br /> D. Water<br /> <br /> 19. Which is the riches type of tropical rain forest in the Philippines?<br /> A. Molave forest<br /> B. Dipterocarp forest<br /> C. Mangrove forest<br /> D. Pine forest<br /> <br /> 20. What muscle is described as involuntary, not striated, and have a single nucleus?<br /> A. Smooth<br /> B. Skeletal<br /> C. Cardiac<br /> D. Connective<br /> <br /> 21. We feel warmer just before it rains because __________.<br /> A. Heat is released by the evaporation of water<br /> B. The clouds prevent heat from escaping the earth<br /> C. There is an increased relative humidity<br /> D. Heat is released by the condensation of water vapor<br /> <br /> 22. Which of the following is not considered as a reproductive cell?<br /> A. Gamete<br /> B. Somatic cell<br /> C. Egg cell<br /> D. Sperm cell<br /> <br /> 23.The cell wall of plant is made of _______.<br /> A. Lipids<br /> B. Cellulose<br /> C. Protein<br /> D. Cell membrane<br /> <br /> 24. Which of the following is the correct sequence of the level of organization from lowest to highest?<br /> A. Cells-system-organs-tissues<br /> B. System-organs-tissues-cells<br /> C. Cells-tissues-organs-system<br /> D. Tissues-systems-cells-organs<br /> <br /> 25.At metaphase of the meiotic division, the chromosomes are attached to the spindle fibers as ________.<br /> A. Double chromatids<br /> B. Non-homologous pairs<br /> C. Single chromatid strands<br /> D. A tetrad of four chromatids<br /> <br /> 26. Which of the following is an example of behavioral adaption?<br /> A. Thick green stems of the cactus plant<br /> B. Thick fur of the bear<br /> C. Shedding leaves during summer<br /> D. Presence of cuticle on the upper surface of the leaves<br /> <br /> 27.The bipolar nature of the cell membrane is due to _______.<br /> A. Presence of carries<br /> B. Presence of<br /> C. Phospholipids bilayer<br /> D. Integral proteins<br /> <br /> 28. Which of the following is made up of diploid number of cells?<br /> A. Zygote<br /> B. Sperm cell<br /> C. Egg cell<br /> D. Both B and C<br /> <br /> 29. Which plant has underground stem modified for reproduction?<br /> A. Ginger<br /> B. Camote<br /> C. Tubers<br /> D. Strawberry<br /> <br /> 30. Which of the following structures serve as a passageway of food and air?<br /> A. Epiglottis<br /> B. Trachea<br /> C. Pharynx<br /> D. Larynx<br /> <br /> 31. Which kind of relationship is exhibited by algae and fungi in lichen?<br /> A. Commensalism<br /> B. Parasitism<br /> C. Symbiosis<br /> D. Competition<br /> <br /> 32. What do you call the finger-like folds on the inner linings of the small intestine?<br /> A. Villi<br /> B. Appendix<br /> C. Rugae<br /> D. Cecum<br /> <br /> 33.Aside from ADP, what else is the end production of the dark-reaction phase of ohotosynthesis?<br /> A. Carbon dioxide<br /> B. Surag<br /> C. Carbon<br /> D. Starch<br /> <br /> 34. What is that flap-like structure that prevents the food from going the wrong way during swallowing?<br /> A. Epiglottis<br /> B. Larynx<br /> C. Esophagus<br /> D. Pharynx<br /> <br /> 35. Which pigment is dominant in red algae?<br /> A. Phycocyanin<br /> B. Fucoxanthin<br /> C. Chlorophyll<br /> D. Pharynx<br /> <br /> 36. What is the membrane that surrounds the lungs?<br /> A. Pleura<br /> B. Meninges<br /> C. Peritoneum<br /> D. Pericardium<br /> <br /> 37. What is that 3-carbon sugar formed during the dark reaction phase of the photosynthesis?<br /> A. ADP<br /> B. NADPH<br /> C. ATP<br /> D. PGAL<br /> <br /> 38. What is the product of carbohydrate digestion?<br /> A. Fatty acid<br /> B. Glucose<br /> C. Amino acid<br /> D. Nucleic acid<br /> <br /> 39. What process is responsible for the upward movement of the water in very tall trees?<br /> A. Osmosis<br /> B. Capillary action<br /> C. Turgor pressure<br /> D. Transpiration<br /> <br /> 40. What is the enzyme in the mouth that breaks starch to maltose?<br /> A. Peptidase<br /> B. Ptyalin<br /> C. Pepsin<br /> D. Maltase<br /> <br /> 41. What do you call the types of symmetry where the body parts are paired on either side of the body?<br /> A. Dorsal<br /> B. Bilateral<br /> C. Radial<br /> D. Ventral<br /> <br /> 42. Which is considered as the respiratory center of the brain?<br /> A. Cerebellum<br /> B. Medulla oblongata<br /> C. Cerebrum<br /> D. Thalamus<br /> <br /> 43. Which stage of incomplete metamorphism is undergone by grasshopper?<br /> A. Nymph, pupa, adult<br /> B. Egg, larva, pupa, adult<br /> C. Egg, nymph, adult<br /> D. Egg, pupa, adult<br /> <br /> 44. Which of the following is NOT part of the thoracic cage?<br /> A. Clavicle<br /> B. Ribs<br /> C. Costal cartilages<br /> D. Sternum<br /> <br /> 45. Where does the toxin substance secreted by bees and ants through their sting originate?<br /> A. Silk glands<br /> B. Intestines<br /> C. Rectal glands<br /> D. Salivary glands<br /> <br /> 46. What is the longest bone in the body?<br /> A. Humerus<br /> B. Ferum<br /> C. Tibia-fibula<br /> D. Clavicle<br /> <br /> 47. Which cause our bones to turn brittle and easily break?<br /> A. Turning into muscle tissues<br /> B. Increase in flexibility<br /> C. Turbidity decrease<br /> D. Removal of collagen<br /> <br /> 48.How many bones does an adult human body has?<br /> A. 201<br /> B. 200<br /> C. 217<br /> D. 206<br /> <br /> 49. What do you call automatic responses to an external stimulus?<br /> A. Reflex<br /> B. Instinct<br /> C. Impulse<br /> D. All of these<br /> <br /> 50. What structure provides flexible support and protection to the spinal cord?<br /> A. Skull<br /> B. Ribs<br /> C. Vertebral column<br /> D. Sternum<br /> <div> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://adf.ly/1F5lda" target="_blank"><img alt="Biological Science" border="0" src="http://2.bp.blogspot.com/-_PFABbawQHQ/VA0kf6_YvjI/AAAAAAAAAZI/9qzE0TiS5Qs/s1600/dl.png" /></a></div>

LET Reviewer in BIOLOGICAL SCIENCE Part 4

Majorship LET Reviewer LET Reviewer for Biological Science PRACTICE TEST  IN BIOLOGICAL SCIENCE 1. Where do producers obtain their ...

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LET Reviewer in BIOLOGICAL SCIENCE Part 3

<div class="bluebox"> Majorship LET Reviewer</div> <br /> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://2.bp.blogspot.com/-jotbPLN52TA/VQwi0OwAPRI/AAAAAAAABKo/GROSlNICFOw/s1600/mcqs-biology.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="LET Reviewer for Biological Science" border="0" src="http://2.bp.blogspot.com/-jotbPLN52TA/VQwi0OwAPRI/AAAAAAAABKo/GROSlNICFOw/s1600/mcqs-biology.jpg" title="LET Reviewer for Biological Science" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">LET Reviewer for Biological Science</td></tr> </tbody></table> <b>PRACTICE TEST</b><b> IN BIOLOGICAL SCIENCE</b><br /> <br /> 1. Binomial nomenclature was introduced by Linnaeus in 1700s. It refers to the giving of two names to an organism composed of the genus and species name. What is the correct way of writing the scientific name of sunflower?<br /> a. helianthus anuus<br /> b. Helianthus anuus<br /> c. helianthus Anuus<br /> d. Helianthus Anuus<br /> <br /> 2. If humans and gorillas belong to the same class, then, they must also belong to the same:<br /> a. Phylum<br /> b. Family<br /> c. Genus<br /> d. Order<br /> <br /> 3. The middle of 1700s is marked by a number of contributions in the field of Biology. Who was the famous Swedish taxonomist who classified living organisms into two kingdoms, the plant and animal kingdoms?<br /> a. Anton van Leeuwenhoek<br /> b. Lazzaro Spallanzani<br /> c. Carolus Linnaeus<br /> c. Joseph Priestley<br /> <br /> 4. At the sea floor of the Marianas trench, a marine biologist was able to dredge an unknown animal species. Which among the following characteristics should he consider?<br /> a. Colonial<br /> b. Unicellular<br /> c. Heterotrophic<br /> d. Presence of cell walls<br /> <br /> 5. Which of the following refers to a pair of contrasting character trait that could be used in constructing a dichotomous key regarding fish tail?<br /> a. Big tail and red tail<br /> b. Short tail and long tail<br /> c. Round tail and blue tail<br /> d. Thin tail and elongate tail<br /> <br /> 6. Three amateur fossil hunters, John, Peter and Sam were able to unearth a complete fossil of a mammal. How could they determine whether it was a carnivore, herbivore or omnivore?<br /> a. Presence of claws<br /> b. Size of the lower jaw<br /> c. Type of teeth present<br /> d. Number of phalanges<br /> <br /> 7. In the cell, metabolic reactions that result from the breakdown of complex molecules into simpler compounds coupled with the release of energy is called as<br /> a. anabolism<br /> b. hydrolysis<br /> c. catabolism<br /> d. synthesis<br /> <br /> 8. Reproduction comes in two types, sexual and asexual. When the offspring inherits all its chromosomes from a single parent (genetically identical), the type of reproduction is asexual. Which of the following asexual type of reproduction is common among hydrozoans like Hydra?<br /> a. Fission<br /> b. Budding<br /> c. Conjugation<br /> d. Fragmentation<br /> <br /> 9. Animals show different types of behavior in order to adapt to a certain condition. In some it could be through a conditioned stimulus. Which type of behavior involves subjecting the organism to repeated stimulation, and if stimulus is harmful it may no longer respond to it?<br /> a. Conditioned reflex<br /> b. Trial and error<br /> c. Habituation<br /> d. Imprinting<br /> <br /> 10. All of the following are unifying themes in Biology except<br /> a. evolution<br /> b. cellular organization<br /> c. molecular inheritance<br /> d. integumentary system<br /> <br /> 11. Atom A shared 2 electrons with Atom B. What bond exists between the two?<br /> a. Ionic<br /> b. Peptide<br /> c. Covalent<br /> d. Hydrogen<br /> <br /> 12. There are four electrons in the outermost energy level of carbon atom. To achieve stability, how many hydrogen (1 in the outermost energy level) atoms must it be covalently bonded to?<br /> a. 2<br /> b. 3<br /> c. 4<br /> d. 5<br /> <br /> 13. Which is a base?<br /> a. Stomach antacids<br /> b. Lemon juice<br /> c. Rain water<br /> d. Vitamin C<br /> <br /> 14. Which principle causes two atoms to attract in ionic bond?<br /> a. Opposite charges attract<br /> b. Removal of proton attracts electron<br /> c. Lesser orbital attracts the energy of greater ones<br /> d. Atoms must achieve 8 electrons in the outermost energy level<br /> <br /> 15. What is the difference of glycogen and cellulose?<br /> a. Glycogen is composed of glucose un its while cellulose is made up of galactose<br /> b. Glycogen is usually found in plants while cellulose is found in lower animals<br /> c. Glycogen polymer is straight while cellulose is highly branched<br /> d. Glycogen is for storage while cellulose is for protection<br /> <br /> 16. Which of the following characteristics is common to prokaryote and eukaryote?<br /> a. Oxidative phosphorylation takes place in the plasma membrane<br /> b. The cilia and flagella have a 9 + 2 arrangement of microtubule<br /> c. Plasma membrane is composed of phospholipid bilayer<br /> d. Nucleus is the center of cellular activities<br /> <br /> 17. Which organelle releases oxygen?<br /> a. Golgi apparatus<br /> b. Mitochondrion<br /> c. Chloroplast<br /> d. Ribosome<br /> <br /> 18. The human skin has a layer of actively dividing cells. If a particular skin cell undergoes mitosis, what is the chromosome number and DNA number of the daughter cells?<br /> a. n and n<br /> b. n and 2n<br /> c. 2n and n<br /> d. 2n and 2n<br /> <br /> 19. Why do vendors sprinkle water on fruits and vegetables that they sell during warm days?<br /> a. It adds mineral to fruits and vegetables<br /> b. It removes pesticides from fruits and vegetables<br /> c. It prevents minerals from escaping from fruits and vegetables<br /> d. It replaces water lost by the cells of fruits and vegetables to the surrounding<br /> <br /> 20. What happens if mitosis does NOT stop?<br /> a. Cancer<br /> b. Anemia<br /> c. Sore eyes<br /> d. Tonsillitis<br /> <br /> 21. Mendel’s Law apply to every statement below except<br /> a. There is random sorting of alleles into ova and sperm<br /> b. Many traits are determined by a pair of hereditary units<br /> c. Each formed gamete receives one of the paired alleles<br /> d. Alleles at loci on the same chromosome may segregate together<br /> <br /> 22. In a population in Hardy-Weinberg equilibrium in which 16 percent of the people have genotypes AA, Assuming the A and a are the only alleles possible, How many percent does the genotype aa have?<br /> a. 16<br /> b. 48<br /> c. 36<br /> d. 24<br /> <br /> 23. Which of the following would be seen if the gene for squash color exhibited incomplete dominance?<br /> a. All of the offspring would exhibit the phenotype of the dominant parent<br /> b. All of the offspring would exhibit the phenotype of the recessive parent.<br /> c. The offspring produced would not express the gene and would be white.<br /> d. Some of the offspring would exhibit a phenotype intermediate to that of the parents<br /> <br /> 24. A man and woman who both have Bb genotypes at a locus will produce what proportion of bb children?<br /> a. 100<br /> b. 75<br /> c. 50<br /> d. 25<br /> <br /> 25. In protein synthesis, which sequence of bases in transfer RNA will pair with the sequence 3’ GGU 5’found in messenger RNA<br /> a. 5’ CCA 3’<br /> b. 3’ CCA 5’<br /> c. 5’AAC 3’<br /> d. 3’UUA 5’<br /> <br /> 26. Refer to the data obtained from the survey of the number of Dengue cases from 2000-2008 in Jose M. Reyes Hospital.<br /> <br /> What appropriate graph can be used for the data?<br /> a. Pie graph<br /> b. Line graph<br /> c. Pictograph<br /> d. Scatter plot diagram<br /> <br /> 27. What is the value of the mode when all values in the data set are different?<br /> a. Highest number<br /> b. Lowest number<br /> c. There is no mode<br /> d. Number at the middle<br /> <br /> 28. Which is NOT a property of the standard normal distribution?<br /> a. uniform<br /> b. unimodal<br /> c. bell-shaped<br /> d. unimodal and symmetric about the mean<br /> <br /> 29. Data that can be classified according to color are measured on what scale?<br /> a. Ratio<br /> b. Ordinal<br /> c. Interval<br /> d. Nominal<br /> <br /> 30. An investigator collects diastolic blood pressure levels on a group of patients. He divides his scale of measurement into intervals of 5 mm Hg (i.e., 70-74 mm Hg, 75-79 mm Hg, 80-84 mm Hg, etc.). The investigator counts the number patients diastolic blood pressures in each interval. If the investigator were to plot the frequency of blood pressure levels in each interval, he would probably choose<br /> a. scatter diagram<br /> b. bar graph<br /> c. histogram<br /> d. pie graph<br /> <br /> 31. Which of the following is considered as the greatest contribution of the middle ages to the study of science?<br /> a. Rhases<br /> b. Anchors<br /> c. Pantheon<br /> d. Universities<br /> <br /> 32. Which of the following best describes the science during the ancient times?<br /> a. fall of the Roman empire<br /> b. rebirth of scientific studies<br /> c. decline of scientific studies and discoveries<br /> d. birth of city-state civilizations near the river or a body of water<br /> <br /> 33. The main goal of the ancient science is “the understanding of nature not changing of nature”. Where does this belong to?<br /> a. Babylonians<br /> b. Egyptians<br /> c. Romans<br /> d. Greeks<br /> <br /> 34. During the Egyptian times, the decimal system was developed. What nature of science can be associated in this event?<br /> a. Science is quantitative<br /> b. Science demand evidences<br /> c. Scientific knowledge is durable<br /> d. Science is blend of logic and imagination<br /> <br /> 35. The 21st century science is more popularly known as<br /> a. Nuclear Age<br /> b. Computer age<br /> c. Age of Scientific Revolution<br /> d. Age of Information Technology<br /> <br /> 36. Where are the genetic materials of bacteria found?<br /> a. Nucleoid region<br /> b. Ribosomes<br /> c. Nucleus<br /> d. Capsule<br /> <br /> 37. Which does NOT belong to the group in the classification of bacteria?<br /> a. Tetrad<br /> b. Coccus<br /> c. Bacillus<br /> d. Sarcinae<br /> <br /> 38. Nitrogen fixation is used to trap nitrogen gas from the atmosphere. It is important in the nitrogen cycle. Which is NOT used in nitrogen fixation?<br /> a. Azotobacter<br /> b. Salmonella<br /> c. Rhizobium<br /> d. Anabaena<br /> <br /> 39. A teacher will show the different integuments of animals to his students. Which will be the best visual aid?<br /> a. Microtechniques<br /> b. Herbarium<br /> c. Taxidermy<br /> d. Aquarium<br /> <br /> 40. A student will observe pollen grains under the microscope. Which method should be used?<br /> a. Smear<br /> b. Squash<br /> c. Teasing<br /> d. Grinding<br /> <br /> 41. A press, a material made of two (2) plywoods will be used by a biology student. Where will he use this?<br /> a. Aquarium<br /> b. Herbarium<br /> c. Taxidermy<br /> d. Microtechniques<br /> <br /> 42. In the hay infusion, what is the importance of grass?<br /> a. Food for microbe<br /> b. Increase turbidity of water<br /> c. Provides oxygen for the protist<br /> d. Regulate temperature of the infusion<br /> <br /> 43. Why are archaebacteria called extremophiles? They can<br /> a. be classified in many ways<br /> b. survive in the absence food<br /> c. can be very small organism<br /> d. live in harsh condition<br /> <br /> 44. A drug was taken in by a mouse in an experiment. It was found out that newly formed virus stayed inside the host cell. In which stage of viral multiplication is the drug acting on?<br /> a. Release<br /> b. Assembly<br /> c. Penetration<br /> a. Attachment<br /> <br /> 45. Which tool is most accurate cutting tool in slide preparation?<br /> a. Blade<br /> b. Incubator<br /> c. Microtome<br /> d. Thermometer<br /> <br /> 46. Which of the choices below show the correct sequence of levels of organization of the human body<br /> a. Atom, cell, tissue, organ, organ system, organism<br /> b. Tissue, atom, cell, organ, organ system, organism<br /> c. Organ, organ system, organism, tissue, atom, cell<br /> d. Organism, cell, organ system, atom, tissue, organism<br /> <br /> 47. The sequence of events happen in urine formation<br /> a. Secretionfiltrationreabsorption<br /> b. Filtrationsecretionreabsorption<br /> c. Reabsorptionsecretionfiltration<br /> d. Filtrationreabsorptionsecretion<br /> <br /> 48. The blood vessels which carry deoxygenated blood from the heart to the lungs are the<br /> a. Pulmonary arteries<br /> b. Coronary arteries<br /> c. Pulmonary veins<br /> d. Coronary veins<br /> <br /> 49. Reena is a 68- year old postmenopausal woman. She always complains of backache every time she does household chores. She was advised by her doctor to take calcium supplements everyday. A bone disorder that might have led to her condition is<br /> a. Rickets<br /> b. Scoliosis<br /> c. Osteoporosis<br /> d. Osteomalacia<br /> <br /> 50. A 15-year old male high school student engaged in a drinking spree. After consuming four bottles of beer he felt dizzy and could not balance well while walking. The part of the brain that is most likely affected is the<br /> a. Pons<br /> b. Thalamus<br /> c. Brainstem<br /> d. Cerebellum<br /> <br /> 51. Food of 10 energy units was taken by an animal in a forest. Which is the possible end of the food?<br /> a. 2 energy units for storage and 8 energy units for metabolic activity<br /> b. 3 energy units for storage and 6 energy units for metabolic activity<br /> c. 4 energy units for storage and 4 energy units for metabolic activity<br /> d. 5 energy units for storage and 2 energy units for metabolic activity<br /> <br /> 52. Which situation will lose or acquire heat by radiation?<br /> a. Swimming in cold waters<br /> b. Hiding in a tree shade<br /> c. Lying on hot rock<br /> a. Sun bathing<br /> <br /> 53. Which shows entropy?<br /> a. Polar caps melting<br /> b. Plant propagation in forests<br /> c. Maintenance of body temperature<br /> d. Usage of food for organism’s survival<br /> <br /> 54. An input was given to a system. At the moment of measurement, there was no output. What is the description of the system?<br /> a. Open<br /> b. Close<br /> c. Open and close<br /> d. Can not be determined<br /> <br /> 55. Lizard 1 has a ventral area of 2 cm2 in contact with the soil. Lizard 2 has a ventral area of 3 cm2 in contact with the soil. Both lizards stayed one (1) minute in contact with the soil. Which will lose heat by conduction at a faster rate?<br /> a. Lizard 1, because of smaller surface area<br /> b. Lizard 1, because time is the same<br /> c. Lizard 2, because of larger surface area<br /> d. Lizard 2, because time is the same<br /> <br /> 56. What factor in a tropical rainforest would the understorey trees and shrubs be most deprived of?<br /> a. Soil<br /> b. Salts<br /> c. Light<br /> d. Water<br /> <br /> 57. What kind of relationship exists between coral polyps and the zooxanthellae (protists) living in their gut?<br /> a. Commensalism<br /> b. Competition<br /> c. Mutualism<br /> d. Parasitism<br /> <br /> 58. Why do producers occupy the base of an energy pyramid?<br /> a. Their biomass is greatest<br /> b. They are greatest in number<br /> c. There is the presence of roots<br /> d. They have the ability to produce own food<br /> <br /> 59. What will happen to the population of organisms of the third trophic level if the second trophic level is eliminated?<br /> a. Increase<br /> b. Decrease<br /> c. Increase then decrease<br /> d. Decrease then increase<br /> <br /> 60. Which feature is true for deserts?<br /> a. always dry<br /> b. always hot and dry<br /> c. always hot, but wet<br /> d. always hot<br /> e. and windy<br /> <div> <br /></div>

LET Reviewer in BIOLOGICAL SCIENCE Part 3

Majorship LET Reviewer LET Reviewer for Biological Science PRACTICE TEST  IN BIOLOGICAL SCIENCE 1. Binomial nomenclature was introd...

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LET Reviewer in BIOLOGICAL SCIENCE Part 2

<div class="bluebox"> Majorship LET Reviewer</div> <br /> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://2.bp.blogspot.com/-jotbPLN52TA/VQwi0OwAPRI/AAAAAAAABKo/GROSlNICFOw/s1600/mcqs-biology.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="LET Reviewer for Biological Science" border="0" src="http://2.bp.blogspot.com/-jotbPLN52TA/VQwi0OwAPRI/AAAAAAAABKo/GROSlNICFOw/s1600/mcqs-biology.jpg" title="LET Reviewer for Biological Science" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">LET Reviewer for Biological Science</td></tr> </tbody></table> <b>PRACTICE TEST</b><b> IN BIOLOGICAL SCIENCE</b><br /> <br /> 51. Now, artificial sheet of skin is composed of epidermis grown from cells of human donors for the treatment of burns. This is called ___________.<br /> a. dermagrafts<br /> b. keratinocytes<br /> c. epithelial grafts<br /> d. cutaneous extensions<br /> <br /> 52. Complete this analogy. Lower arm: radius and ulna :: Legs: _________<br /> a. femur and tibia<br /> b. tibia and fibula<br /> c. femur and fibula<br /> d.sacral and lumbar<br /> <br /> 53. When you enter suddenly a well-lighted room after coming from a dark room, you experience not seeing things clearly for some reasons. This is because _________.<br /> a. the pupils are not adapted to the dark<br /> b. the eyes are adapted to light only<br /> c. the pupils constrict due to light intensity<br /> d. light had caused temporary blindness<br /> <br /> 54. What is the most common cause of a cardiovascular disease?<br /> a. Fatty deposits in the arteries<br /> b. Inadequate supply of red blood cells<br /> c. Lack of sodium in the diet<br /> d. Increased heartbeat<br /> <br /> 55. Which of the following criterion is used to distinguish between two species?<br /> a. Reproduction<br /> b. Physical traits<br /> c. Time<br /> d. Geography<br /> <br /> 56. Which region of vertebrate forebrain is concerned with the neural-endocrine control of visceral activities?<br /> a. Cerebellum<br /> b. Thalamus<br /> c. Hypothalamus<br /> d. Pituitary<br /> <br /> 57. Why is it NOT advisable to remove the tonsils of children even if they become inflamed occasionally?<br /> a. They contain lymphocytes that fight bacteria.<br /> b. They are needed in sensing the taste of foods.<br /> c. They help in swallowing food easily<br /> d. They contain blood platelets.<br /> <br /> 58. What strong connective tissue attaches a skeletal muscle to a bone?<br /> a. Myofibril<br /> b. Tendon<br /> c. Ligament<br /> d. Cartilage<br /> <br /> 59. Doctors can now ask the pathologists to help them diagnose diseases from far away places through special computer hardware. They can view slides of tissue samples as they are hooked to the internet. The method is termed _____________.<br /> a. micropathology<br /> b. histopathology<br /> c. telepathology<br /> d. pathological diagnosis<br /> <br /> 60. We are warned to stay away from a place that can generate sound at a hundred decibels in order to _________________.<br /> a. balance the semi-circular canal<br /> b. keep the stirrup safe<br /> c. protect the Eustachian tube<br /> d. protect the tympanic membrane<br /> <br /> 61. Which condition may result in high blood pressure?<br /> a. Relaxed phase of heartbeat<br /> b. Decreased blood volume<br /> c. Constriction of the blood vessels<br /> d. Increased blood volume<br /> <br /> 62. Is the bone tissue classified living or nonliving?<br /> 1-Nonliving, it does not grow in size.<br /> 2-Living, is capable of producing new bone tissue<br /> 3-Living, it is supplied with blood vessels.<br /> 4-Nonliving, it does not contain ATP for energy.<br /> a. 1 and 4<br /> b. 1 only<br /> c.4 only<br /> d. 2 and 3<br /> <br /> 63. What is the function of parathyroid hormone?<br /> a. Lowers blood calcium level.<br /> b. Regulates the activity of the thyroid gland<br /> c. Raises blood calcium level<br /> d. Controls physical and mental growth<br /> <br /> 64. The number of red blood cells per cubic milliliter of blood is 5,000,000 in men and 4,500,000 in women. What is the advantage of this for men?<br /> a. Men do strenuous activities and need more energy.<br /> b. They have bigger physique and need more blood.<br /> c. Men waste more blood cells and need extra.<br /> d. They are more prone to anemia disorder.<br /> <br /> 65. What part of the brain assists in recalling important information learned?<br /> a. Medulla oblongata<br /> b. Cerebrum<br /> c. Midbrain<br /> d. Cerebellum<br /> <br /> 66. Why are lips “redder” than our palm?<br /> a. There is increased blood flow in the lips.<br /> b. Lips are heavily keratinized.<br /> c. Lip epidermis is thinner.<br /> d. Many blood vessels are located around the lips.<br /> <br /> 67. Which is carnivorous plant?<br /> a. Pitcher plant<br /> b. Kataka-taka<br /> c. Cactus<br /> d. Fire tree<br /> <br /> 68. The hormone that assists liver cells to convert glycogen into glucose is ________.<br /> a. insulin<br /> b. glycerine<br /> c. glucagon<br /> d. glycerol<br /> <br /> 69. Which of the following pancreatic fluids is responsible for the breakdown of fat?<br /> a. Lipase<br /> b. Amylase<br /> c. Chymotrypsin<br /> d. Trypsin<br /> <br /> 70. A female who is a carrier ofcolorblindness marries a normal male. What is the probability that their child will be colorblind?<br /> a. 25%<br /> b. 75%<br /> c. 100%<br /> d. 50%<br /> <br /> 71. In mammalian cloning, the organism resulting from the technology is similar to the ________.<br /> a. owner of somatic cell<br /> b. surrogate mother<br /> c. owner of embryonic cell<br /> d. location of the somatic cell<br /> <br /> 72. Mutation that is brought about by the earth’s natural radioactivity is referred to as _________.<br /> a. continuous<br /> b. induced<br /> c. spontaneous<br /> d. controlled<br /> <br /> 73. In a double-stranded DNA, which of the following are complementary to each other?<br /> a. Thymine and Cytosine<br /> b. Guanine and Cytosine<br /> c. Adenine and Guanine<br /> d. Adenine and Uracil<br /> <br /> 74. What microbial organisms are used in the creation of genetically modified organisms?<br /> a. Pseudomonas aeruginosa<br /> b. Agrobacterium tumafaciens<br /> c. Bacillus thuringiensis<br /> d. Escherichia coli<br /> <br /> 75. The technique that involves finding exact location of gene in the 46 chromosomes of a human call is called ________.<br /> a. DNA sequencing<br /> b. gene mapping<br /> c. gene cloning<br /> d. recombinant maps<br /> <br /> 76. What substance in the chromosomes is responsible for the chemical properties of genes?<br /> a. Nitrogenous base<br /> b. Protein<br /> c. Nucleotide<br /> d. Ribonucleic acid<br /> <br /> 77. Mad cow’s disease is caused by ____________.<br /> a. viroid<br /> b. prion<br /> c. phage<br /> d. virus<br /> <br /> 78. What microbial organisms are used in the creation of genetically modified such as Bt corn?<br /> a. Pseudomonas aeruginosa<br /> b. E. coli<br /> c.Bacillus thuringiensis<br /> d. Bacterium tumafaciens<br /> <br /> 79. Which fossil bird has marked reptilian characteristics?<br /> a. Archaeopteryx<br /> b. Bat<br /> c.Lemur<br /> d. Pterodactyl<br /> <br /> 80. The project which involves the mapping of the genes in all the man’s 46 chromosomes is<br /> a. stem-cell production<br /> b. genetic engineering<br /> c. cloning of organisms<br /> d. human genome<br /> <br /> 81. The number of autosomes and type of sex chromosomes normally present in the human egg cell is ____.<br /> a. 22+X<br /> b. 44+XY<br /> c. 44+X<br /> d. 22+Y<br /> <br /> 82. Comparing the bonding patterns of DNA fragments retrieved at the scene of the crime with those obtained from primary suspect is a procedure employed by _______.<br /> a. forensic experts<br /> b. gene therapy experts<br /> c. DNA technologists<br /> d. transgenic technologist<br /> <br /> 83. The process of fusing cells without cell walls as in protoplasts fusion makes use of facilitating substances such as _______.<br /> a. gel electrophoresis<br /> b. restrictions enzymes<br /> c. polyethylene glycol<br /> d. DNA probes<br /> <br /> 84. The first dinosaur fossil found in USA in 1818 was described to possess _______.<br /> a. long body and tail<br /> b. huge mouth and teeth<br /> c. huge skull but with a small brain<br /> d. large legs and feet<br /> <br /> 85. Three brothers have blood types A, B and O. What are the chances that the parents of these traits will produce a fourth child whose blood type is AB?<br /> a. 50%<br /> b. 100%<br /> c. 0%<br /> d. 25%<br /> <br /> 86. When the gene pair is heterozygous, only one is physically expressed and the other is hidden, which law is explained?<br /> a. Incomplete dominance<br /> b. Dominance<br /> c. Independent assortment<br /> d. Segregation<br /> <br /> 87. What is the role of decomposers in nitrogen cycle?<br /> a. Fix nitrogen of the air into ammonia.<br /> b. Convert ammonia into nitric acid.<br /> c. Denitrify nitrogen compounds.<br /> d. Release ammonia to the soil.<br /> <br /> 88. Lamarck’s theory of evolution proposed that changes occur as a result of need for them, hence called the law of ________.<br /> a. survival of the fittest<br /> b. use and disuse<br /> c. acquired characters traits<br /> d. natural selection<br /> <br /> 89. A male and a female who both have Rr genotypes at a locus will produce what proportion of rr children.<br /> a. 75%<br /> b. 25%<br /> c. 100%<br /> d. 50%<br /> <br /> 90. What is the organic base found only in RNA?<br /> a. Uracil<br /> b. Guanine<br /> c. Cytosine<br /> d. Thymine<br /> <br /> 91. Differentiate RNA from DNA.<br /> a. RNA is single strand and the sugar is deoxyribose.<br /> b. RNA is a single strand and the sugar is ribose.<br /> c. DNA is a single strand and the sugar is deoxyribose.<br /> d. RNA is a double strand and the sugar is ribose.<br /> <br /> 92. What results when two alleles both appear in the phenotype?<br /> a. Incomplete dominance<br /> b. Codominance<br /> c. Sex-linked genes<br /> d. Multiple allelism<br /> <br /> 93. A male and female with Tt genotype will produce with zygote. Which will NOT be a correct ratio?<br /> a. 1:2:2<br /> b. 1:2:1<br /> c. 2:1:1<br /> d. 1:1:2<br /> <br /> 94. The process involved in the production of mRNA using DNA as template is termed ___________.<br /> a. transcription<br /> b. replication<br /> c. gene manipulation<br /> d. reverse transcription<br /> <br /> 95. A male and female who both have Bb genotypes will produce zygotes in which of the following ratios?<br /> a. 1 BB: 2 Bb: 2 bb<br /> b. 1 BB: 1 Bb: 1 Bb<br /> c. 1 BB: 2 Bb: 1 bb<br /> d. 2 BB: 1 Bb: 1 bb<br /> <br /> 96. Fossils may be formed at ocean bottoms in the form of imprints or molds of an organism’s body. Such formation is called _____________.<br /> a. trapped in water<br /> b. preservation<br /> c. sedimentation<br /> d. petrification<br /> <br /> 97. The inner lining of the uterus consisting of connective tissues, glands and blood vessels through which nutrient reach the embryo is called ________.<br /> a. endometrium<br /> b. placenta<br /> c. chorionic villi<br /> d. ureter<br /> <br /> 98. Which statement supports Darwin’s theory of evolution?<br /> a. Variation is not essential to species evolution.<br /> b. Few offspring produced are involved in the evolution process.<br /> c. Unfavorable mutations favor general evolution.<br /> d. Organisms with favorable adaptation tend to survive.<br /> <br /> 99. Adenosine diphosphate is a molecule involved in molecular energy transfers that is typically formed by __________.<br /> a. accumulation of nucleotides<br /> b. hydrolysis of NADH<br /> c. hydrolysis of ATP<br /> d. absorption of phosphate<br /> <br /> 100. Studies show that there are parts of the body that have lost their usefulness and which may later disappear. What are these parts called?<br /> a. Fossil<br /> b. Residual<br /> c. Extinct<br /> d. Vestigial<br /> <br />

LET Reviewer in BIOLOGICAL SCIENCE Part 2

Majorship LET Reviewer LET Reviewer for Biological Science PRACTICE TEST  IN BIOLOGICAL SCIENCE 51. Now, artificial sheet of skin i...

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LET Reviewer in BIOLOGICAL SCIENCE Part 1

<div class="bluebox"> Majorship LET Reviewer</div> <br /> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://2.bp.blogspot.com/-jotbPLN52TA/VQwi0OwAPRI/AAAAAAAABKo/GROSlNICFOw/s1600/mcqs-biology.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="LET Reviewer for Biological Science" border="0" src="http://2.bp.blogspot.com/-jotbPLN52TA/VQwi0OwAPRI/AAAAAAAABKo/GROSlNICFOw/s1600/mcqs-biology.jpg" title="LET Reviewer for Biological Science" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">LET Reviewer for Biological Science</td></tr> </tbody></table> <b>PRACTICE TEST</b><b> IN BIOLOGICAL SCIENCE</b><br /> <br /> 1. Which type of cytoskeletal structure is involved in flagella formation?<br /> a. Microtrabecule<br /> b. Intermediate filament<br /> c. Microfilament<br /> d. Microtubule<br /> <br /> 2. Compounds with the same chemical formula but with different structural formula are called _____________.<br /> a. polymer<br /> b. double stranded<br /> c. isomer<br /> d. helices<br /> <br /> 3. Which are small, irregularly-shaped cells without nuclei but are rich in ATP?<br /> a. Leukocyte<br /> b. Thrombocytes<br /> c. Lymphocytes<br /> d. Erythrocytes<br /> <br /> 4. Why can an eighty-seven percent (87%) salt solution keep a frog tissue alive for observation? Because its osmotic pressure is<br /> a. less than that of the cell<br /> b. equal to that of the cell<br /> c. varied<br /> d. greater than that of the cell<br /> <br /> 5. What type of muscle tissue lines hollow structures like ducts and blood vessels that contracts involuntarily?<br /> a. Skeletal<br /> b. Cardiac<br /> c. Striated<br /> d. Smooth<br /> <br /> 6. Which characteristic of cancer cells differentiates them from normal cells?<br /> a. Cancer cells continue to divide even when they are tightly packed<br /> b. Cancer cells are unable to synthesize DNA<br /> c. Cancer cells undergo indirect cell division<br /> d. The cell cycle of cancer cells is arrested in the S phase<br /> <br /> 7. Studying the characteristic structure and functions of all kinds of cells entails investigations in _____________.<br /> a. cytology<br /> b. morphology<br /> c. embryology<br /> d. histology<br /> <br /> 8. How many ATP molecules are produced via oxidative phosphorylation when one (1) mole of glucose is degraded into carbon dioxide and water?<br /> a. 4<br /> b. 24<br /> c. 34<br /> d. 6<br /> <br /> 9. Which of the following exemplifies phagocytic feeding?<br /> a. Red blood cells<br /> b. Virus<br /> c. Platelets<br /> d. White blood cells<br /> <br /> 10. Which tissue in all vascular plants has food transport as its main function?<br /> a. Sclerenchyma<br /> b. Palisade<br /> c. Phloem<br /> d. Xylem<br /> <br /> 11. Which is the 3-carbon sugar formed during the dark reaction phase of photosynthesis?<br /> a. PGAL<br /> b. ADP<br /> c. ATP<br /> d. NADPH<br /> <br /> 12. A leaf could be identified either as dicot or monocot by _____________.<br /> a. pressing whether soft or hard<br /> b. looking at the shape and size<br /> c. examining venation<br /> d. looking at the stomata<br /> <br /> 13. Which hormone stimulates the growth of lateral buds and sprouts on branches of trees?<br /> a. Cytokinin<br /> b. Auxin<br /> c. Abscissic acid<br /> d. Gibberelin<br /> <br /> 14. “Leaf fall” which regularly occurs during winter months, resulting in the separation of layers near the base of the petiole is a condition called _____________.<br /> a. annual sheds<br /> b. senescence<br /> c. abscission<br /> d. dormancy<br /> <br /> 15. Which part of a seed appears as a scar which marks the entry of the pollen tube during fertilization?<br /> a. Epicotyl<br /> b. Tegmen<br /> c. Testa<br /> d. Hilum<br /> <br /> 16. Which of the following is a part of the process of chemiosmosis?<br /> a. Build up of hydrogen ion concentration<br /> b. Absorption of light energy by chloroplasts<br /> c. Movement of electrons through membranes<br /> d. Splitting of water molecules<br /> <br /> 17. During the light-reaction phase of photosynthesis, the addition of the phosphate group with the aid of sunlight is called _____________.<br /> a. photophosphorylation<br /> b. carbohydrate synthesis<br /> c. ribulose formation<br /> d. electron transfer<br /> <br /> 18. Common shrubs like gumamela and bougainvilleas reproduce asexually by _____________.<br /> a. spore formation<br /> b. fission<br /> c. fertilization<br /> d. vegetative propagation<br /> <br /> 19. In vascular plants, which type of tissue is responsible for the secondary growth in stems and roots?<br /> a. Cytomembrane<br /> b. Cambium<br /> c. Palisade layer<br /> d. Dermal layer<br /> <br /> 20. What type of root system is found among grass and other lower plants?<br /> a. Primary<br /> b. Tap<br /> c. Fibrous<br /> d. Branched<br /> <br /> 21. Which biome grows tropical grassland with scattered individual trees and large herbivores?<br /> a. Tundra<br /> b. Desert<br /> c. Taiga<br /> d. Savanna<br /> <br /> 22. Which are correctly paired according to their functions?<br /> a. Xylem and cambium<br /> b. Root hair and meristem<br /> c. Lenticel and stomata<br /> d. Phloem and vascular ray<br /> <br /> 23. The stems/trunks of dicotyledonous plants grow wide in diameter due to the presence of the _____________________.<br /> a. dermal layer<br /> b. sclerenchyma<br /> c. mesophyll<br /> d. cambium layer<br /> <br /> 24. What are the usual reactions of leaves and roots of plants to conditions in the environment?<br /> 1-Phototropism : 2-Thigmotropism : 3-Geotropism : 4-Chemotropism<br /> a. 2 and 4<br /> b. 1 and 3<br /> c. 2 and 3<br /> d. 1 and 4<br /> <br /> 25. Who experimented on the gas released during photosynthesis and what gas did he find out?<br /> a. Robert Mayer, nitrogen<br /> b. Jan Helmont, oxygen<br /> c. Joseph Priestly, oxygen<br /> d. Jean Senebier, hydrogen<br /> <br /> 26. By what type of process does a severed portion of a starfish grow into a full starfish?<br /> a. through sex cells<br /> b. bud formation<br /> c. vegetative propagation<br /> d. regeneration<br /> <br /> 27. What is the common reaction of protozoans to an acidic substance like vinegar?<br /> a. Slight<br /> b. Positive<br /> c. No reaction<br /> d. Negative<br /> <br /> 28. The diverticulum of the esophagus is for temporary storage of food as in a bird’s ___.<br /> a. crop<br /> b. gizzard<br /> c. cecum<br /> d. palate<br /> <br /> 29. How can we differentiate an arthropod from annelids?<br /> a. An arthropod has a segmented body; an annelid has non segmented body.<br /> b. Some arthropods have wings; an annelid has legs.<br /> c. An arthropod has exoskeleton; an annelid has endoskeleton.<br /> d. An arthropod has jointed legs; an annelid has none.<br /> <br /> 30. What do we call the ability of young ducklings to imitate the way their mother duck walks?<br /> a. Disguising<br /> b. Imprinting<br /> c. Mimicking<br /> d. Adapting<br /> <br /> 31. Birds shed off feathers at least once a year through the process called _________.<br /> a. skinning<br /> b. molting<br /> c. furrowing<br /> d. migrating<br /> <br /> 32. Which of the following feature of echinoderms like the starfish consists of a system of internal canals extending to the surface?<br /> a. Wall perforations<br /> b. Hydrostatic system<br /> c. Tube feet system<br /> d. Water-vascular system<br /> <br /> 33. Which animal belongs to the order PRIMATES?<br /> a. Porpoise<br /> b. Ape<br /> c. Whale<br /> d. Bat<br /> <br /> 34. A mother bird partially digests the food and places an amount into the young’s beak. This process is called __________.<br /> a. external digestion<br /> b. regurgitation<br /> c. feeding dependence<br /> d. redigestion<br /> <br /> 35. The photoreceptor units found in the compound eyes of insects are called ________.<br /> a. ommatidia<br /> b. visual nerve<br /> c. sclera<br /> d. visual stimulators<br /> <br /> 36. According to the geologic history of life on earth, during which era did mammals appear?<br /> a. Mesozoic<br /> b. Cenozoic<br /> c. Paleozoic<br /> d. Triassic<br /> <br /> 37. Which of the following is NOT thought to be an ancestor of humans?<br /> a. Fish<br /> b. Bird<br /> c. Snake<br /> d. Monkey<br /> <br /> 38. What organ assists the fish to float in their habitat?<br /> a. Air sacs<br /> b. Air bladder<br /> c. Gall bladder<br /> d. Dorsal aerators<br /> <br /> 39. What chemical controls metamorphosis among insects?<br /> a. Pheromones<br /> b. Estradiol<br /> c. Enzymes<br /> d. Hormones<br /> <br /> 40. Mammals experience a very minimal change in their body temperature as they move from a warm location to an extremely cold place because they are ___________.<br /> a. cryptophilic<br /> b. poikolothermic<br /> c. thermophilic<br /> d. homeothermic<br /> <br /> 41. What emergency hormone increases the supply of sugar and oxygen in the blood for more energy?<br /> a. Insulin<br /> b. Pituitrin<br /> c. Thyroxine<br /> d. Adrenalin<br /> <br /> 42. If bone has osteocytes, skin has _____________.<br /> a. chondrocytes<br /> b. fibrocytes<br /> c. melanocytes<br /> d. osteoblasts<br /> <br /> 43. What is the recent technology being used now in the surgery of the retina?<br /> a. CT scan<br /> b. Laser<br /> c. Grafts<br /> d. X-ray<br /> <br /> 44. What may happen with the carbon dioxide concentration in the blood if you hold your breath for half a minute? The carbon dioxide concentrations will ____________.<br /> a. fluctuate<br /> b. decrease<br /> c. remains the same<br /> d. increase<br /> <br /> 45. Which of the following vitamins is needed for the clotting factor synthesis?<br /> a. E<br /> b. D<br /> c. K<br /> d. B<br /> <br /> 46. Damaged blood vessels are repaired by __________.<br /> a. thrombocytes<br /> b. erythrocytes<br /> c. leukocytes<br /> d. phagocytes<br /> <br /> 47. Which muscle disorder accounts for skeletal muscle tissue degeneration that causes a person to experience progressive weakness?<br /> a. Atrophy<br /> b. Dystrophy<br /> c. Cramps<br /> d. Hypertrophy<br /> <br /> 48. Which of the following vitamins is needed for erythrocytes production?<br /> a. B12<br /> b. D<br /> c. E<br /> d. A<br /> <br /> 49. When erythrocytes are found in the urine, the condition is diagnosed as ________.<br /> a. hematuria<br /> b. cystitis<br /> c. glomerulonephritis<br /> d. hemophilia<br /> <br /> 50. Which part of our body serves as a lever, a kind of simple machine?<br /> a. Ligament<br /> b. Spinal Cord<br /> c. Bone<br /> d. Tendon<br /> <br />

LET Reviewer in BIOLOGICAL SCIENCE Part 1

Majorship LET Reviewer LET Reviewer for Biological Science PRACTICE TEST  IN BIOLOGICAL SCIENCE 1. Which type of cytoskeletal struc...

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LET Reviewer for SCIENCE (NATURAL SCIENCE)

<div class="bluebox"> LET Reviewer in General Education</div> <br /> <table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> <tr><td><a href="http://4.bp.blogspot.com/-8BOymaD10BA/VQu3HwESwdI/AAAAAAAABJI/763fJcTC9ps/s1600/mcqs-general-education.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img alt="LET Reviewer for General Education" border="0" src="http://4.bp.blogspot.com/-8BOymaD10BA/VQu3HwESwdI/AAAAAAAABJI/763fJcTC9ps/s1600/mcqs-general-education.jpg" title="LET Reviewer for General Education" /></a></td></tr> <tr><td class="tr-caption" style="font-size: 12.8000001907349px;">LET Reviewer for General Education</td></tr> </tbody></table> <b>PRACTICE TEST FOR GENERAL EDUCATION</b><br /> <b><i>GENERAL | NATURAL SCIENCE</i></b><br /> <br /> 1. Which is not considered as adaptive mechanism of living things?<br /> a. Modification of body parts to suit the environment.<br /> b. Presence of specialized structures like thorns and fins.<br /> c. Possession of camouflage features like color, pattern or shape.<br /> d. Reproduction for the preservation of a certain species.<br /> <br /> 2. Biologists are at present involved in gene manipulation by altering the genes in nuclei. Which aims seem to be the most important of such manipulation?<br /> a. to cure ancient genetic diseases like cancer<br /> b. to prolong life<br /> c. to create new types of agricultural plants and animals<br /> d. to make significant changes in man himself<br /> <br /> 3. Which chemical substance produced by the body regulates and coordinates the functions and activities of bodily organ?<br /> a. gene<br /> b. Deoxyribonucleic acid<br /> c. hormone<br /> d. enzyme<br /> <br /> 4. Which endocrine abnormality is characterized by dwarfness, low intelligence and sex immaturity?<br /> a. myxedema<br /> b. cretinism<br /> c. tetany <br /> d. acromegaly<br /> <br /> 5. What is the present connotation of symbiosis?<br /> a. a give and take relationship of organism<br /> b. any type of relationship between two dissimilar organisms living together<br /> c. a one- sided relationship between two species<br /> d. neutral relationship that exist between two organisms<br /> <br /> 6. Living things are classified either as aerobic or anaerobic as they grow or metabolize in the presence or absence of:<br /> a. carbon dioxide<br /> b. nitrogen<br /> c. water<br /> d. oxygen<br /> <br /> 7. What is the structural difference between plants and animals?<br /> a. Plant cells have plastids but animal cells do not.<br /> b. Plant cells have a stiff cell wall of cellulose but animal cells do not.<br /> c. Animal cells have centriole but the cells of higher plants do not.<br /> d. Plant cells have only a thin membrane but animals do not.<br /> <br /> 8. Only living things can respond to stimuli, to physical and chemical changes in their environment. Such a characteristic is called:<br /> a. metabolism<br /> b. irritability<br /> c. movement<br /> d. specific organization<br /> <br /> 9. The preservation of specie is made possible through:<br /> a. reproduction<br /> b. adaptation<br /> c. metabolism<br /> d. growth<br /> <br /> 10. Which process involves in the movement of dissolved molecules (solute) through a differentially permeable membrane?<br /> a. diffusion<br /> b. osmosis<br /> c. Brownian movement<br /> d. dialysis<br /> <br /> 11. Which refers to the earth’s entire zone of air, land and water which occupied by living things?<br /> a. biosphere<br /> b. biome<br /> c. bioassay<br /> d. biomass<br /> <br /> 12. Which body organ is responsible for the removal of waste from the blood and body fluids?<br /> a. liver<br /> b. pancreas<br /> c. kidney<br /> d. large intestine<br /> <br /> 13. What is meant by excretion?<br /> a. Elimination of waste and undigested food from the anus.<br /> b. Removal from the cells and blood streams of substances which are no further use in the body.<br /> c. Release from the cell of some substance that is utilized elsewhere in some bodily process.<br /> d. Absorption of soluble food by the body cells.<br /> <br /> 14. The clotting of the blood is essentially the function of:<br /> a. red blood cells<br /> b. white corpuscles<br /> c. plasma<br /> d. hemoglobin<br /> <br /> 15. All living things have a tendency to maintain uniformity or stability in their internal environment called:<br /> a. anabolism<br /> b. metabolism<br /> c. epigenesist<br /> d. homeostasis<br /> <br /> 16. What is an ecosystem?<br /> a. A basic unit that shows interaction between living things and their environment.<br /> b. A recognizable unit which shows plant and animal distribution as influenced primarily by climate.<br /> c. A fundamental unit that shows various types of relationship among organism.<br /> d. A distinct unit that shows how physical factor can affect other abiotic components in the environment.<br /> <br /> 17. Which plant structure transports organic nutrients both up and down the stem and roots?<br /> a. xylem<br /> b. vascular bundle <br /> c. parenchyma<br /> d. phloem<br /> <br /> 18. Under what condition does a living organism live best or has the greatest chance of survival?<br /> a. maximal<br /> b. minimal<br /> c. optimum<br /> d. standard<br /> <br /> 19. Which traps light energy from the sun for use in the photosynthesis?<br /> a. carbon dioxide<br /> b. water<br /> c. chlorophyll<br /> d. oxygen<br /> <br /> 20. Smoking cigarettes:<br /> a. causes ulcer<br /> b. decreases the vital capacity of the stomach<br /> c. leads to emphysema and lung cancer<br /> d. leads to abnormal life<br /> <br /> 21. Blood cells and plasma factors are important:<br /> a. immune defense<br /> b. invaders<br /> c. external defenses<br /> d. internal defenses<br /> <br /> 22. A spinal nerve is:<br /> a. motor nerve<br /> b. sensory nerve<br /> c. neuron<br /> d. mixed nerve<br /> <br /> 23. The anterior pituitary stimulates the:<br /> a. motor coordination<br /> b. consciousness<br /> c. sense reception<br /> d. homeostasis<br /> <br /> 24. What do all methods of birth control have in common?<br /> a. they all use some device<br /> b. they are all expensive<br /> c. they interrupt lovemaking<br /> d. they prevent the egg from coming in contact with the sperm<br /> <br /> 25. Pregnancy begins:<br /> a. upon successful implantation <br /> b. during the follicular phase <br /> c. when the egg is fertilized<br /> d. when ovulation occurs<br /> <br /> 26. The fact that many insects are now immune to DDT is an example of:<br /> a. natural selection<br /> b. genetic drift<br /> c. geographical isolation<br /> d. translocation<br /> <br /> 27. The nutrient glucose is useful to the body:<br /> a. to prevent goiter <br /> b. as a source of energy <br /> c. active reabsorption<br /> d. during the process of respiration<br /> <br /> 28. Radiant energy is covered into chemical energy during:<br /> a. oxidation<br /> b. glycosis<br /> c. respiration<br /> d. photosynthesis<br /> <br /> 29. Which of the following is not a form of vegetative reproduction?<br /> a. regeneration<br /> b. budding<br /> c. spore formation<br /> d. vegetation by runners<br /> <br /> 30. Nitrogenous waste is produced by the metabolism of:<br /> a. fats <br /> b. carbohydrates<br /> c. proteins<br /> d. starches<br /> <br /> 31. Which of the following is a reflex act?<br /> a. breathing<br /> b. blinking<br /> c. walking<br /> d. sleeping<br /> <br /> 32. In an ecosystem:<br /> a. only energy is recycled <br /> b. only materials are recycled <br /> c. both materials and energy are recycled<br /> d. neither materials nor energy is recycled<br /> <br /> 33. Distribution of plants is affected by:<br /> a. type of soil<br /> b. amount of light<br /> c. amount of rainfall<br /> d. A, B, and C are correct<br /> <br /> 34. Which decoction contains traces of iron to arrest hemorrhage?<br /> a. corn silk<br /> b. ampalaya leaves flowers<br /> c. gumamela<br /> d. coconut milk<br /> <br /> 35. Hyperacidity can destroy the lining of the stomach. Which of the following substance can ease the discomfort?<br /> a. water therapy<br /> b. milk of magnesia<br /> c. starch solution<br /> d. gelatin<br /> <br /> 36. Deficiency of carbohydrates is characterized by:<br /> a. sluggishness<br /> b. pallor<br /> c. obesity<br /> d. bone deformation<br /> <br /> 37. Salt as a preservative causes:<br /> a. cell shrinkage<br /> b. ionization<br /> c. hydrolysis<br /> d. hydration<br /> <br /> 38. What do you call the practical or industrial application based on scientific principles?<br /> a. scientific method<br /> b. technology<br /> c. theory <br /> d. experimentation<br /> <br /> 39. What is the principal cause of earthquakes?<br /> a. faulting <br /> b. landslides<br /> c. nuclear explosions<br /> d. volcanic eruptions<br /> <br /> 40. Purification of metals can be done best by:<br /> a. filtration <br /> b. flotation<br /> c. aeration<br /> d. electrolysis<br /> <br /> <br /> Click the download button below to download this practice set <i>with answers</i> in PDF format.<br /> <a href="http://adf.ly/1Bi1kF" target="_blank"><img alt="Natural Science" border="0" src="http://2.bp.blogspot.com/-_PFABbawQHQ/VA0kf6_YvjI/AAAAAAAAAZI/9qzE0TiS5Qs/s1600/dl.png" /></a>

LET Reviewer for SCIENCE (NATURAL SCIENCE)

LET Reviewer in General Education LET Reviewer for General Education PRACTICE TEST FOR GENERAL EDUCATION GENERAL | NATURAL SCIENCE ...

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