17. A tRNA molecule, on average, contains ______ nucleotides. (A) 30 (B) 50 (C) 67 (D) 76 (E) 100.

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.