Cofactors are non-protein chemical compounds or metallic ions that are required for an enzyme's activity as an activator or a catalyst. They are not involved in energy provision through phosphorylation, competition with substrates, regulation of enzyme expression at the DNA level, or covalent linkage to the enzyme's active site to increase its activity.

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A Cofactor

Question 17

Multiple Choice

A cofactor

A) provides energy for enzyme activity by adding phosphate residues to particular amino acids (phosphorylation) .
B) competes with the substrate to bind to the active site of an enzyme.
C) controls enzyme activity by regulating expression of the DNA coding for the enzyme.
D) is an additional molecule or ion that enables the enzyme to function.
E) is covalently linked to the active site of an enzyme to increase activity.

Correct Answer: