V_max for an enzyme-catalyzed reaction: A) generally increases when pH increases. B) increases in the presence of a competitive inhibitor. C) is limited only by the amount of substrate supplied. D) is twice the rate observed when the concentration of substrate is equal to the K_m. E) is unchanged in the presence of a uncompetitive inhibitor.

Question

Quizplus · Accepted Answer

Vmax is the maximum rate of an enzyme-catalyzed reaction and is achieved when the enzyme is saturated with substrate. At this point, increasing substrate concentration does not increase the rate. When substrate concentration equals Km, the reaction rate is half of Vmax, so Vmax is twice the rate at Km.

Vmax for an Enzyme-Catalyzed Reaction

V_max for an Enzyme-Catalyzed Reaction