Choose the correct answer from the four answer choices (A), (B), (C) and
(D), given with each question.
1. Enzymes are composed mainly of
(A) Polysaccharides (C) Proteins
(B) Lipids (D) Nucleic acids
2. The enzyme (catalyst) for DNA replication is
(A) DNA
(B) mRNA
(C) DNA polymerase
(D) RNA polymerase
3. The enzyme which catalyzes the replication of the leading strand during
DNA replication in E. coli is
(A) RNA polymerase
(B) reverse transcriptase
(C) DNA polymerase 11
(D) DNA polymerase III
4. The enzyme which catalyzes the replication of the lagging strand during
DNA replication in E. coil is
(A) reverse transcriptase
(B) DNA polymerase I
(C) DNA polymerase II
(D) DNA polymerase III
5. The enzyme (catalyst) for RNA synthesis in prokaryotes is
(A) DNA
(B) mRNA
(C) DNA polymerase
(D) RNA polymerase
6. The enzyme (catalyst) for protein synthesis in prokaryotes is
(A) DNA
(B) mRNA
(C) RNA polymerase
(D) part of the structure of the ribosome
7. Protein catalyst for chemical reactions in biological system are
(A) Enzyme
(B) Hormones
(C) Vitamin
(D) Both hormones and coenzyme
8. The first enzyme diastase was isolated by
(A) Macleod and Avery
(B) McCarty
(C) Payen and Persoz
(D) Hershey and Chase
9. A single enzyme may break down in a second
(A) 100 molecules of the substance
(B), 10,000 molecules of the substance
(C) 100,000 molecules of the substance
(D) 1000 molecules of the substance
10. Payen and Persoz isolated the first ever enzyme called
(A) Maltase
(B) Sucrase
(C) Diastase
(D) Lactase
11. The first enzyme isolated in pure form by Payen and Persoz was
(A) Hydrogenase
(B) Glucase
(C) Diastase
(D) Phosphatase
12. Enzymes are chemically
(A) Carbohydrates
(B) Proteins
(C) Lipids
(D) Waxes
13. Enzymes are catalysts, after the completion of a reaction they are
chemically
(A) Changed
(B) Unchanged
(C) Substitute
(D) Reconstitute
14. The first enzyme diastase was isolated by
(A) Hershey and Chase
(B) Payen and Persoz
(C) Mcleod and McCarty
(D), Watson and Crick
15. Which statement about enzymes is not true?
(A) They consist of proteins, with or without a non-protein part
(B) They change the rate of catalyzed reaction.
(C) They are sensitive to heat.
(D) They are non-specific in their action.
16. Which of the following is not a true statement about enzymes?
(A) They are catalysts.
(B) They are produced by ductless glands.
(C) They increase the rate of chemical change.
(D) They act in only one type of reaction.
17. Which of the following enzymes is found in pancreatic juice?
(A) Lipase
(B) Maltase
(C) Ptyalin
(D) Pepsin
18. Which of the following is the best definition of an enzyme?
(A) A complex substance which can only act in the body at a particular
temperature
(B) A complex substance which must be present in the diet of animals in
order that they remain healthy.
(C) A complex organic compound which accelerates the growth rate in plants.
(D) A complex organic compound which speeds up a particular reaction in the
bodies of animals and plants.
19. Which one of the following
digestive juices does not contain enzymes?
(A) Pancreatic juice
(C) Saliva
(B) Gastric juice
(D) Bile juice
20. Which one of the following is tilt organic material of an enzyme?
(A) Carbohydrate
(B) Vitamin
(C) Protein
(D) Fat
21. The substances on which the enzymes act are called
(A) Co-enzymes
(C) Substrates
(B) Activators
(D) Inhibitors
22. If more substrate to an already occurring enzymatic reaction is added,
more enzyme activity is seen because
(A) then is probably more substrate present than there is enzyme.
(B) then is probably more enzyme available than there is substrate.
(C) Then is probably more product present than there in either substrate or
enzyme.
(D) the enzyme substrate complex is probably failing to form during the
reaction.
23. If you add more substrate to already occurring enzymatic reaction and
it has no effect on the rate of reaction, what is the form given for this
situation?
(A) Saturation
(C) Composition
(B) Desaturation
(D) Inhibition
24. Which of the following is not true for protein
(A) Enzyme
(C) Co-enzyme
(B) Hormone
(D)
25. It is difficult to study enzyme action in
(A) Vitro
(C) Vitro and Vivo
Desaturation Inhibition true for protein? Hormone Hemoglobin action in
(B) Vivo
(D) None of these
26. Which of the following factors affect the rate of enzyme action
(A) enzyme concentration
(B) Substrate concentration
(C) temperature
(D) All of these
27. Optimum pH value of pepsin is
(A) 1.10
(B) 1.50
(C) 1.70
(D) 2.00
28. Optimum pH value of sucrase is
(A) 1.90
(B) 2.10
(C) 3.50
(D) 4.50
29. The rate of an enzyme-catalyzed reaction
(A) is constant under all conditions
(B) decreases as substrate concentration increases
(C) cannot be measured
(D) can be reduced by inhibition
30. What is the optimum pH value of Enterokinase?
(A) 2.30
(B) 2.70
(C) 4.20
(D) 5.50
31. What is the optimum pH value of salivary amylase?
(A) 4.50
(B) 4.90
(C) 5.80
(D) 6.80
32. The active site of an enzyme
(A) never changes
(B) forms no chemical bond with substrate
(C) determines, by its structure, the specificity of thee enzyme
(D) looks like a lump projecting from the surface of an enzyme
33. Whose optimum pH value ranges between 7.00 - 8.00?
(A) Sucrase
(B) Chymotrypsin
(C) Catalase
(D) Pepsin
34. Which of the following enzymes has optimum pH value 7.60?
(A) Catalase
(B) Sucrase
(C) Salivary amylase
(D) Arginase
35. Whose optimum pH value is 9.00?
(A) Pancreatic lipase
(B) Pepsin
(C) Enterokinase
(D) Chymotrypsin
36. Whose optimum pH value is 9.70?
(A) Pancreatic lipase
(B) Sucrase
(C) Arginase
(D) Salivary amylase
37. Salivary amylase works best at___ in the buccal cavity.
(A) pH 6.6
(B) pH 6.9
(C) pH 7.5
(D) pH 8.1
38. Pepsin functions best in the stomach at
(A) pH 1.5
(B) pH 2.0
(C) pH 2.5
(D) pH 3.2
1. C 2. C 3. D 4. D 5. D 6. D 7. A 8. C 9. C 10. C 11. C 12. B 13. B 14. B
15. D 16. " B 17. A 18. D 19. D 20. C 21. C 22. A 23. A 24. C 25. B 26. D
27. D 28. D 29. B 30. D 31. D 32. C 33. B 34. A 35. A 36. C 37. C 38. B
Online MCQS Preparation (MCAT Biology Book-1) Chapter No.3
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