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Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the inhibitory effect of malonic acid.
-What is the purpose of using malonic acid in this experiment?
A)It is a competitive inhibitor.
B)It blocks the binding of fumarate.
C)It is a noncompetitive inhibitor.
D)It is able to bind to succinate.
E)It replaces the usual enzyme.

Question

Quizplus · Accepted Answer

Malonic acid is a competitive inhibitor because it resembles succinate and competes for the active site of succinate dehydrogenase, reducing its inhibitory effect when the concentration of succinate is increased.

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