61. Which of the following descriptions about the Michaelis-Menten equation is false? (A) KM measures the substrate concentration at which the reaction rate is 1/2Vmax. (B) An enzyme with a low KM means that it has low affinity for its substrate. (C) An enzyme with a low kcat means that it has a low catalytic rate. (D) The turnover number, kcat, measures the rate of the catalytic process. (E) The ratio kcat/KM is a convenient measure of enzyme efficiency.