32. Which of the following statements about enzymes is FALSE? A) They are unchan

Question

32. Which of the following statements about enzymes is FALSE? A) They are unchanged in a biochemical reaction. B) They are proteins (but sometimes RNA) C) They increase the rate of a biochemical reaction. D) They change the products of a biochemical reaction. E) They lower the activation energy of a biochemical reaction 33. The theory that proposes a somewhat flexible enzyme and substrate conformation during formation of an enzyme-substrate complex is called the A) Lock and key theory B) Induced fit theory C) Physical fit theory D) Expanding fit theory E) Central dogma of molecular biology 34. What class of enzyme would catalyze this reaction? A) oxidoreductase B) transferase C) hydrolase D) lyase E) isomerase 35. What class of enzyme would catalyze the conversion of glucose into fructose? A) oxidoreductase B) transferase C) hydrolase D) lyase E) isomerase 36. Which of the following might be found in the active site of an enzyme? A) substrate binding residue B) catalytic residue C) metal ion D) coenzyme E) all of these 37. Which of the following, if plotted on the x-axis, would lead to the graph shown for enzyme activity (plotted on y-axis)? Assume all other variables are held constant. A) enzyme concentration B) substrate concentration C) temperature D) pH E) concentration of inhibitor 38. Which of the following, if plotted on the x-axis, would lead to the graph shown for enzyme activity (plotted on y-axis)? Assume all other variables are held constant A) enzyme concentration B) substrate concentration C) temperature D) pH E) concentration of inhibitor 39. Some enzymes in the metabolic pathway that breaks down glacose and produces ATP are inhibited by ATP. This is an example of what type of inhibition? A) competitive B) noncompetitive C) feedback D) irreversible E) catalytic Page 6 of 14

Explanation / Answer

32.

(D)

33.

(A)

34.

(A) Because the carbonyl group is reduced to alcohol group

35.

(B)(A)

36.

(E)

37.

(A)

38.

(A)

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