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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. coenzyme derived from a vitamin. d. cofactor that is an activator of the enzyme.

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Answer: Option D) cofactor that is an activator of the enzyme.

Explanation:

A cofactor is a non-organic component (usually a metal) of an enzyme or protein, that enhances its function. Good examples of Cofactors include iron in hemoglobin, zinc in carboxypeptidase.

Zinc at the active site of the enzyme, carboxypeptidase helps it in cleaving off aromatic amino acids.

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