An enzyme,citrate synthase,in the Krebs cycle is inhibited by ATP.This is an example of all of the following EXCEPT
A)allosteric inhibition.
B)competitive inhibition.
C)feedback inhibition.
D)noncompetitive inhibition.

Question

Quizplus · Accepted Answer

Citrate synthase inhibition by ATP is an example of allosteric inhibition (where the inhibitor binds to a site other than the active site), feedback inhibition (since ATP is a product of cellular respiration, its abundance signals the cell to slow down the Krebs cycle), and noncompetitive inhibition (as the inhibitor does not compete with the substrate for the active site). It is not an example of competitive inhibition, where the inhibitor would compete directly with the substrate for binding to the active site.

An Enzyme,citrate Synthase,in the Krebs Cycle Is Inhibited by ATP