Exercise: Enzymes

Questions for: Enzymes

The proteolysis rate enhancement by chymotrypsin (~1010 folds) corresponds to a reduction in activation energy of about
A:
40 kJ/mol
B:
49 kJ/mol
C:
58 kJ/mol
D:
88 kJ/mol
Answer: C
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What is the specificity of the Clostripain protease?
A:
It cleave after Arg residues
B:
It cleave after His residues
C:
It cleave after Lys residues
D:
None of the above
Answer: A
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Tryprotophan synthetase of E.coli, a typical bifunctional oligomeric enzyme consist of
A:
a protein designated A
B:
two proteins designated A and B
C:
a protein A and one-subunit a
D:
a protein designated B
Answer: B
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Which of the following statements about enzymes or their function is true?
A:
Enzymes do not alter the overall change in free energy for a reaction
B:
Enzymes are proteins whose three-dimensional form is key to their function
C:
Enzymes speed up reactions by lowering activation energy
D:
All of the above
Answer: D
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Which of the following (s) is/are serine proteases?
A:
Chymotrypsin
B:
Trypsin
C:
Elastase
D:
all of these
Answer: D
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