Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as a(n)
A) competitive inhibitor of the enzyme.
B) noncompetitive inhibitor of the enzyme.
C) allosteric activator of the enzyme.
D) cofactor necessary for enzyme activity.
E) coenzyme derived from a vitamin.

Question

Quizplus · Accepted Answer

Zinc functions as a cofactor necessary for enzyme activity, specifically in the active site of carboxypeptidase. It serves to stabilize the transition state during the enzymatic reaction.

Zinc, an Essential Trace Element for Most Organisms, Is Present