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LET Reviewer Biology Part 3 A. Man does strenuous activities and need
1. Where do producers obtain their energy? more energy
A. From other producers B. They have bigger physique and need more
B. From the consumers blood
C. From the decomposers C. Man waste more blood cells and need extra
D. From the sun D. They are more prone to anemia disorders

2. Why do you experience not seeing things 9. Which of the following is the building block
clearly for some seconds when you enter suddenly of protein?
a well-lighted room after coming from a dark room, A. Amino acid
you? B. Nucleotide
A. The pupils are not adapted to the dark C. Fatty acid
B. The eyes are adapted to the light only D. Monosaccharide
C. The pupils are not dilated yet
D. Light had caused temporary blindness 10. Where does protein synthesis take place?
A. Ribosomes
3. What term is used to describe the ability to B. Lysosomes
maintain a constant internal environment? C. Endoplasmic reticulum
A. Metabolism D. Golgi bodies
B. Growth and development
C. Homeostasis 11. Why are our lips “redder” than our palm?
D. Thermoregulation A. There is increased blood flow in the lips
B. Lips are heavily keratinized
4. What is the most common cause of C. Lip epidermis is thinner
cardiovascular disease? D. Many blood vessels are located around the
A. Fatty deposits in the arteries lips
B. Inadequate supply of red blood cells
C. Lack of sodium in the diet 12. Which of the following cannot be found in
D. Increased heartbeat prokaryotes?
A. Cytoplasm
5. Which is the smallest unit of life that can B. Plasma membrane
survive and reproduce on its own? C. Membrane-bound nucleus
A. Cell D. DNA
B. Organ
C. Tissues 13. What do we call mutation that is brought
D. Population about by the earth natural radioactivity?
A. Continuous
6. Which region of a vertebrate forebrain is B. Induced
considered with the neutral-endocrine control of C. Lysosomes
visceral activities? D. Chloroplast
A. Cerebellum
B. Thalamus 14. Which of the following organelles produces
C. Hypothalamus turbo pressure against cell wall and mainly acts as
D. Pituitary water reservoir
A. Plastids
7. Which of the following is the building block
carbohydrate? B. Vacuole
A. Amino acid C. Lysosomes
D. Chloroplast
B. Nucleotide
C. Fatty acid 15. What is the branch crobial organisms is
D. Monosaccharide used in the creation of genetically modified
organisms?
8. Why it is necessary men have more red A. Pseudomonas vulgaris
blood cells per cubic millimeter of blood than B. Bacillus thuringensis
women? C. Agro bacterium tumafaciens
D. Escherichia coli
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D. Cell membrane
16. What is the branch of zoology that is
devoted to the study of fish? 24. Which of the following is the correct
A. Helmintology sequence of the level of organization from lowest to
B. Ichthyology highest?
C. Chondrichthyes A. Cells-system-organs-tissues
D. Ornithology B. System-organs-tissues-cells
C. Cells-tissues-organs-system
17. The process involved in the production of D. Tissues-systems-cells-organs
mRNA using DNA as template is termed ?
A. Transcription 25. At metaphase of the first meiotic division,
B. Replication the chromosomes are attached to the spindle fibers
C. Gene manipulation as
D. Reverse transcription .
A. double chromatids
18. What is the most abundant inorganic B. non-homologous pairs
compound in the protoplasm? C. single chromatid strand
A. Fluid D. a tetrad of chromatids
B. Blood
C. Plasma 26. Which of the following is an example of
D. Water behavioral adaption?
A. Thick green stems of the cactus plant
19. Which is the riches type of tropical rain B. Thick fur of the bear
forest in the Philippines? C. Shedding leaves during summer
A. Molave forest D. Presence of cuticle on the upper surface of
B. Dipterocarp forest the leaves
C. Mangrove forest
D. Pine forest 27. The bipolar nature of the cell membrane is
due to .
20. What muscle is described as involuntary, A. Presence of carries
not striated, and have a single nucleus? B. Presence of
A. Smooth C. Phospholipids bilayer
B. Skeletal D. Integral proteins
C. Cardiac
D. Connective 28. Which of the following is made up of diploid
number of cells?
21. We feel warmer just before it rains because A. Zygote
.
A. Heat is released by the evaporation of water B. Sperm cell
B. The clouds prevent heat from escaping the C. Egg cell
earth D. Both B and C

C. There is an increased relative humidity 29. Which plant has underground stem
D. Heat is released by the condensation of modified for reproduction?
water vapor A. Ginger
B. Camote
22. Which of the following is not considered as C. Tubers
a reproductive cell? D. Strawberry
A. Gamete
B. Somatic cell 30. Which of the following structures serve as a
C. Egg cell passageway of food and air?
D. Sperm cell A. Epiglottis
B. Trachea
23. The cell wall of plant is made of . C. Pharynx
A. Lipids D. Larynx
B. Cellulose
C. Protein
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31. Which kind of relationship is exhibited by

algae and fungi in lichen? 39. What process is responsible for the upward
A. Commensalism movement of the water in very tall trees?
B. Parasitism A. Osmosis
C. Symbiosis B. Capillary action
D. Competition C. Turgor pressure
D. Transpiration
32. What do you call the finger-like folds on the
inner linings of the small intestine? 40. What is the enzyme in the mouth that
A. Villi breaks starch to maltose?
B. Appendix A. Peptidase
C. Rugae B. Ptyalin
D. Cecum C. Pepsin
D. Maltase
33. .Aside from ADP, what else is the end
production of the dark-reaction phase of 41. What do you call the types of symmetry
ohotosynthesis? where the body parts are paired on either side of
A. Carbon dioxide the body?
B. Surag A. Dorsal
C. Carbon B. Bilateral
D. Starch C. Radial
D. Ventral
34. What is that flap-like structure that
prevents the food from going the wrong way during 42. Which is considered as the respiratory
swallowing? center of the brain?
A. Epiglottis A. Cerebellum
B. Larynx
C. Esophagus B. Medulla oblongata
D. Pharynx C. Cerebrum
D. Thalamus
35. Which pigment is dominant in red algae?
A. Phycocyanin 43. Which stage of incomplete metamorphism
is undergone by grasshopper?
B. Fucoxanthin A. Nymph, pupa, adult
C. Chlorophyll B. Egg, larva, pupa, adult
D. Pharynx C. Egg, nymph, adult
D. Egg, pupa, adult
36. What is the membrane that surrounds the
lungs? 44. Which of the following is NOT part of the
A. Pleura thoracic cage?
B. Meninges A. Clavicle
C. Peritoneum B. Ribs
D. Pericardium C. Costal cartilages
D. Sternum
37. What is that 3-carbon sugar formed during
the dark reaction phase of the photosynthesis? 45. Where does the toxin substance secreted by
A. ADP bees and ants through their sting originate?
B. NADPH A. Silk glands
C. ATP B. Intestines
D. PGAL C. Rectal glands
D. Salivary glands
38. What is the product of carbohydrate
digestion? 46. What is the longest bone in the body?
A. Fatty acid A. Humerus
B. Glucose B. Ferum
C. Amino acid C. Tibia-fibula
D. Nucleic acid D. Clavicle
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47. Which cause our bones to turn brittle and

easily break?
A. Turning into muscle tissues
B. Increase in flexibility
C. Turbidity decrease
D. Removal of collagen

48. .How many bones does an adult human

body has? A. 201
B. 200
C. 217
D. 206

49. What do you call automatic responses to an

external stimulus?
A. Reflex
B. Instinct

C. Impulse
D. All of these

50. What structure provides flexible support

and protection to the spinal cord?
A. Skull
B. Ribs
C. Vertebral column
D. Sternum
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26. C
Biology Part 3 Answer Keys 27. C
28. A
1. D 29. C
2. C 30. C
3. C 31. C
4. A 32. A
5. A 33. B
6. C 34. A
7. D 35. D
8. A 36. D
9. A 37. D
10. A 38. B
11. C 39. B
12. C 40. B
13. C 41. B
14. B 42. B
15. D 43. C
16. B 44. A
17. A 45. C
18. D 46. B
19. B 47. D
20. A 48. D
21. D 49. A
22. B 50. C
23. B
24. C
25. D