Enzymes and Kinetics – Section 1

26. A noncompetitive inhibitor of an enzyme-catalyzed reaction

A. increases KM and increases Vmax
B. increases KM and reduces Vmax
C. reduces KM and increases Vmax
D. reduces KM and reduces Vmax

Correct Answer: B. increases KM and reduces Vmax

27. An allosteric inhibitor of an enzyme usually

A. participates in feedback regulation
B. denatures the enzyme
C. is a hydrophobic compound
D. causes the enzyme to work faster

Correct Answer: A. participates in feedback regulation

28. Which of the following activity is possible by transferases?

A. Transfer of methyl groups
B. Transfer of glycosyl group
C. Both (a) and (b)
D. None of these

Correct Answer: C. Both (a) and (b)

29. A classical uncompetitive inhibitor is a compound that binds

A. reversibly to the enzyme-substrate complex yielding an inactive ESI complex
B. irreversibly to the enzyme-substrate complex yielding an inactive ESI complex
C. reversibly to the enzyme-substrate complex yielding an active ESI complex
D. irreversibly to the enzyme-substrate complex yielding an active ESI complex

Correct Answer: A. reversibly to the enzyme-substrate complex yielding an inactive ESI complex

30. Which graphical method is used to determine an enzyme degree of cooperativity?

A. Hill plot
B. Koshland curve
C. Michaelis-Menten hyperbola
D. Can not be determined

Correct Answer: A. Hill plot

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