11. Proteins with two different polypeptide chains are:(A) monomeric proteins. (B) trimeric proteins. (C)homodimeric proteins. (D)heterodimeric proteins. none of the above.

3. All of the following functions of an enzyme are true EXCEPT:(A) Enzymes help to catalyze virtually every metabolic reaction.(B) Enzymes mediate the rates of cellular reaction in proportion to cellular requirements.(C) Enzymes are sensitive to temperature, pH, and concentration changes.(D) An increased activity of an enzyme increases the amount of energy produced.(E) Enzymes are used as a catalyst to increase reaction rates many orders of magnitude.

11. Proteins with two different polypeptide chains are:
(A) monomeric proteins.
(B) trimeric proteins.
(C)homodimeric proteins.
(D)heterodimeric proteins. none of the above.

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