31. All $\alpha$-amino acids except ______ contain a chiral $\alpha$-carbon. (A) Gly (B) Ala (C) Ile (D) His (E) Met.

4. Which of the following descriptions about the Michaelis-Menten rate equation is incorrect ? (A) KM measures the substrate concentration at which the reaction rate is Vmax/2 (B) kcat is the turnover number that measures the rate of the catalytic process (C) The ratio kcat/KM is a convenient measure of enzyme efficiency (D) kcat = Vmax/[Enz] (E) A competitive inhibitor decreases the apparent KM.

31. All $\alpha$-amino acids except ______ contain a chiral $\alpha$-carbon.
(A) Gly
(B) Ala
(C) Ile
(D) His
(E) Met.

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