Exercise: Enzymes

Questions for: Enzymes

The cleavage specificity of trypsin and chymotrypsin depend in part on the
A:
proximity of Ser 195 to the active site or specificity pocket
B:
size, shape, and charge of the active site or specificity pocket
C:
presence of a low-barrier hydrogen bond in the active site or specificity pocket
D:
absence of water in the active site
Answer: B
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The role of Asp 102 and His 57 during trypsin catalysis is to
A:
neutralize the charge on the other's side chain
B:
keep the specificity pocket open
C:
function as a proton shuttle
D:
clamp the substrate into the active site
Answer: C
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The nucleophile in serine proteases is
A:
Serine
B:
water
C:
both (a) and (b)
D:
Asparagine
Answer: C
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In the enzyme-catalyzed reaction shown below, what will be the effect on substances A, B, C, and D of inactivating the enzyme labeled E2?

A ---(E1)---> B ---(E2)---> C ---(E3)--->

A:
A, B, C, and D will all still be produced
B:
A, B, and C will still be produced, but not D
C:
A and B will still be produced, but not C or D
D:
A will still be produced, but not B, C, or D
Answer: C
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Which of the following is false statement with regard to comparison between Serine and HIV proteases?
A:
Both use nucleophilic attack to hydrolyze the peptide bond
B:
Both require water to complete the catalytic cycle
C:
Both forms an acyl-enzyme intermediate
D:
Both show specificity for certain amino acid sequences
Answer: C
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