Zinc Is an Essential Trace Element for Most Organisms

Multiple Choice

Zinc is an essential trace element for most organisms. Zinc is required in the active site of the enzyme carboxypeptidase where it most likely functions in which of the following ways?

A) as a noncompetitive inhibitor of the enzyme
B) as an allosteric activator of the enzyme
C) as a cofactor necessary for enzyme activity
D) as a coenzyme derived from a vitamin