13. Molecules of a given protein have all EXCEPT: (A) fixed amino acid composition. (B) a defined amino acid sequence.(C) a sequence read from C-terminal end to N-terminal end.(D) an invariant molecular weight.(E) a nucleotide sequence from which they are encoded.

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.

13. Molecules of a given protein have all EXCEPT:
(A) fixed amino acid composition.
(B) a defined amino acid sequence.
(C) a sequence read from C-terminal end to N-terminal end.
(D) an invariant molecular weight.
(E) a nucleotide sequence from which they are encoded.

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