What is the proper order for the sequence of the

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34. What is the proper order for the sequence of the following events in the catalytic mechanism of chymotrypsin? a) The O atom of the active site Ser nucleophilically attacks the carbonyl C of the scissile bond. b) The active site His acts as an acid catalyst to the N atom of the scissile bond. c) The active site His acts as a base catalyst to the active site Ser residue. A) a, then b, then c D) b, then a, then c B) a, then c, then b E) c, then a, then b C) b, then c, then a F) c, then b, then a 35. What is the effect of cholesterol in a membrane? Page 4 trans -oleate (18:1) (3) linoleate (18:2) (1) cis -oleate (18:1) (2)
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36. Which of the following considerations in the rate of a given reaction can be optimized by enzymatic catalysis: 37. To which class does the enzyme that catalyzes the following reaction belong? 38. The initial velocity ( v 0 ) of an enzyme-catalyzed reaction A) decreases as the substrate concentration increases B) is lowest when the enzyme is saturated with substrate C) is dependent upon the substrate concentration D) is independent of the pH of the solution E) none of the above are correct 39. In order for an enzymatic reaction obeying the Michaelis–Menten equation to reach 3/4 of its maximum velocity, 40. What is the relationship between the nucleophilicity and the acidity of an amino acid side chain? A) The greater the acidity, the more nucleophilic the group B) The greater the acidity, the less nucleophilic the group Use the following to answer questions 41-42: The structure of the drug prednisone is shown below. 41. What kind of molecule is this? Page 5
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42. What is the most likely means of transport of this molecule into the cell? Use the following to answer questions 43-44: Consider the enzyme plot below.
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