NEET Zoology Practice Test Paper 1 by TEACHING CARE online tuition and coaching classes

NEET Zoology Practice Test Paper 1 by TEACHING CARE online tuition and coaching classes

     

1. The process that joins amino acids together to make enzymes is
2. oxidation.
3. hydrolysis.
4. denaturation.
5. dehydration synthesis.

 

2. Which of the following is a unit molecule of hydrolysis?
3. ADP when it is being converted into ATP.
4. Cellulose when it is being converted into glucose.
5. Fatty acids when they are being converted into lipid.
6. Amino acids when they are being converted into protein.

 

3. Which of the following is an amino (amine) group?
4. NH₂
5. OH^–1
6. PO4^–3
7. COOH

 

4. The level of protein structure represented by the alpha-helix shape is
5. primary.
6. secondary.
7. tertiary.
8. quaternary.

 

5. The linear sequence of amino acids found in an enzyme is called its
6. tertiary structure.
7. primary structure.
8. secondary structure.

D.quaternary structure.

 

6. Proteins may denature when
7. pH is changed.
8. oxygen is present.
9. they form enzymes.
10. substrate concentration is increased.

B

7. When a protein loses its normal three-dimensional configuration, it is said to be A. saturated.
8. denatured.
9. neutralized.
10. synthesized.

 

8. Which of the following is a function of some proteins?
9. Emulsify fats.
10. Make up genes.
11. Make up cell walls.
12. Speed up chemical reactions.

 

9. A glucose molecule contains
10. six carbon atoms.
11. two high-energy phosphates.
12. three fatty acids and glycerol.
13. a long chain of

carbohydrate rings.

 

10. One of the functions of DNA is to
11. secrete vacuoles.
12. make copies of itself.
13. join amino acids to each other.
14. carry genetic information out of the nucleus.

 

11. Two sugars found in nucleic acids are
12. sucrose and ribose.
13. glucose and fructose.
14. deoxyribose and ribose.
15. deoxyribose and glucose.

 

12. The number of adenine bases in a DNA molecule equals the number of thymine bases because
13. A. DNA contains equal numbers of all four bases.
14. B. thymine always follows adenine on each DNA strand.
15. C. DNA is made of alternating adenine and thymine bases.
16. D. adenine on one strand

bonds to thymine on the other strand.

 

13. Which of the following would not occur during complementary base pairing? A. A-T
14. B. U-G
15. C. C-G
16. D. A-U

C

14. Which of the following describes a DNA molecule?
15. Double helix of glucose sugars and phosphates.
16. Ladder-like structure composed of fats and sugars.
17. Double chain of nucleotides joined by hydrogen bonds.
18. A chain of alternating phosphates and nitrogenous bases.

C

15. Which of the following is an example of complementary base pairing?
16. Thymine – uracil.
17. Guanine – adenine.
18. Adenine – thymine.

D.Cytosine – thymine.

 

16. Which of the following is the correct matching of base pairs in DNA?
17. Adenine–Guanine and Thymine–Uracil.
18. Guanine–Cytosine and Adenine–Uracil.
19. Adenine–Thymine and Guanine–Cytosine.
20. Guanine–Thymine and Adenine–Cytosine.

A

17. DNA replication involves the breaking of bonds between
18. bases.
19. sugars and bases.
20. phosphates and bases.
21. sugars and phosphates.

C

18. Two functions of rough endoplasmic reticulum are to
19. detoxify and transport drugs.
20. modify and activate hormones.
21. synthesize and transport enzymes.
22. join with and hydrolyze food vacuoles.

A

19. In which of the following is the greatest amount of deoxyribonucleic acid (DNA) found?
20. nucleus
21. ribosome
22. nucleolus
23. nuclear envelope

C 20. Most of the cell membrane is made from

1. steroids.
2. proteins.
3. phospholipids.
4. polysaccharides.

C

21. Which organelle contains enzymes that digest old cells?
22. nucleus
23. ribosome
24. lysosome
25. Golgi body

C

22. Specialized vacuoles containing molecules that catalyze the hydrolysis of macromolecules are
23. nucleoli.
24. ribosomes.
25. lysosomes.
26. chromosomes.

D

23. An organelle composed of membranous tubules that synthesize testosterone is the
24. vacuole.
25. Golgi apparatus.
26. rough endoplasmic reticulum.
27. smooth endoplasmic reticulum.

C

24. The most abundant molecules in the cell membrane are
25. steroids.
26. proteins.
27. phospholipids.
28. carbohydrates.

B

25. A function of smooth endoplasmic reticulum is to
26. form ribosomes.
27. synthesize lipids.
28. store nucleic acid.
29. breakdown carbohydrates.

 

26. Carrier molecules that bring materials into cells are
27. lipids.
28. proteins.
29. glycogen.
30. phospholipids.

B

27. The fluid-mosaic membrane model describes the membrane as having a
28. sheet of protein.
29. phospholipid bilayer.
30. sugar-phosphate backbone.
31. complementary base template.

A

28. Molecules in the cell membrane that function as receptors are
29. proteins.
30. glycerol.
31. cholesterol.
32. phospholipids.

B

29. Cell membranes are composed mainly of
30. sugars and phosphates.
31. phospholipids and proteins.
32. carbohydrates and cellulose.

D.nucleotides and carbohydrates.

A

30. Which of these substances cannot pass through cell membranes?
31. Starch.
32. Glycerol.
33. Amino acids.
34. Monosaccharides.

C

31. Which of the following conditions is required for diffusion to occur?
32. ATP energy.
33. A living cell.
34. A concentration difference.
35. A selectively-permeable membrane.

B

32. The rate of diffusion across the cell membrane is affected by the
33. temperature and pinocytosis.
34. temperature and size of the molecule.
35. membrane structure and phagocytosis.
36. shape of glycolipids and glycoproteins.

C

33. Frog eggs placed in an isotonic solution will
34. burst.
35. shrink.
36. remain the same.
37. increase in volume

C

34. Enzymes function to increase the rate of a metabolic reaction by
35. denaturing the substrate.
36. adding energy to the reaction.
37. decreasing the energy of activation.
38. increasing the concentration of the reactants.

D

35. An enzyme speeds up a chemical reaction by
36. regulating pH.
37. acting as a buffer.
38. preventing denaturation.
39. lowering the energy of activation.

C

36. The role of an enzyme in a chemical reaction is to
37. emulsify fats.
38. prevent denaturation.
39. speed up the reaction.
40. buffer any acids or bases.

B

39. Enzymes often
40. absorb fatty acids.
41. help in hydrolysis reactions.
42. serve as a long term source of energy.
43. serve as the structural framework of cell walls.

B

38. In the cell, enzymes act as
39. buffers.
40. catalysts.
41. neurotransmitters.
42. emulsifying agents.

C

39. Enzymes consist of chains of
40. fatty acids.
41. nucleotides.
42. amino acids.
43. carbohydrates.

C

40. Compounds that are needed for enzymes to function properly are
41. buffers.
42. steroids.
43. vitamins.
44. heavy metals.

B

41. A non-protein molecule that aids the action of an enzyme to which it is loosely bound is called
42. initiator.
43. coenzyme.

C.competitive inhibitor.                                                                                                                              D. enzyme-substrate complex

 

42. Tissue lining the esophagus is
43. nervous.
44. muscular.
45. epithelial.
46. connective.

C

43. Which of the following is a connective tissue?
44. Skin.
45. Brain.
46. Blood.
47. Muscle.

A

44. Similar cells which are joined together form
45. a tissue.
46. an organ.
47. cytoplasm.
48. an organ system.

D

45. Tissues that hold structures together and provide support and protection are
46. nerve tissues.
47. epithelial tissues.
48. epidermis tissues.
49. connective tissues.

C

46. 1. Organ 2. Cell 3. Organ system 4. Tissue

From left to right, the sequence that represents increasing complexity is

1. 1, 3, 2, 4
2. 2, 1, 3, 4
3. 2, 4, 1, 3
4. 2, 4, 3, 1

D

47. Blood is a type of
48. nervous tissue.
49. epithelial tissue.
50. muscular tissue.
51. connective tissue.

D

48. Digestion is defined as the process whereby
49. glucose is converted to glycogen.
50. carbon dioxide is reduced to carbohydrate.
51. proteins are absorbed into the bloodstream.
52. food is chemically and physically broken down.

D

49. Which of the following describes peristalsis?
50. the physical breakdown of fats
51. production of vitamins by E. coli
52. release of enzymes by the pancreas
53. muscle contractions of the digestive tract

 

50. Which type of blood vessel has thick walls in order to withstand high pressure? A. vein
51. artery
52. arteriole
53. capillary

A

 

Answers

1. D
2. B
3. A
4. B
5. B
6. A
7. B
8. D
9. A
10. B
11. C
12. D
13. B
14. C
15. C
16. C
17. A
18. C
19. A
20. C
21. C
22. C
23. D
24. C
25. B
26. B
27. B
28. A
29. B
30. A
31. C
32. B
33. C
34. C
35. D
36. C
37. B
38. B
39. C
40. C
41. B
42. C
43. C
44. A
45. D
46. C
47. D
48. D
49. D
50. B

 

Hints and explainations:-

1. Dehydration means to take water out. Thus when you use dehydration synthesis, you are building something up while taking water out.

4. Quaternary Structure is the combination of two or more chains, to form a complete unit. The interactions between the chains are not different from those in tertiary structure, but are distinquished only by being interchain rather than intrachain.

6.Denaturation is a process in which proteins or nucleic acids lose their tertiary structure and secondary structure by application of some external stress or compound, such as a strong acid or base etc

15. A -T, G-C

25 Rough endoplasmic reticulua synthesize proteins, while smooth endoplasmic reticulua synthesize lipids and steroids, metabolize carbohydrates and steroids, and regulate calcium concentration, drug detoxification, and attachment of receptors on cell membrane proteins

34. Activation energy may also be defined as the minimum energy required to start a chemical reaction

38  Neurotransmitters are endogenous chemicals which transmit signals from a neuron to a target cell across a synapse

41  A cofactor is a non-protein chemical compound that is bound to a protein and is required for the protein’s biological activity. These proteins are commonly enzymes, and cofactors can be considered “helper molecules” that assist in biochemical transformations. Cofactors can also be classified depending on how tightly they bind to an enzyme, with loosely-bound cofactors termed coenzymes and tightly-bound cofactors termed prosthetic groups.