1. There are a total of ______ “sense” codons in the genome. (A) 4 (B) 16 (C) 61 (D) 64 (E) 72.

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.