31. The Km and Vmax of hexokinase I for glucose are 100  μM and 30 μM/min and the Km and Vmax of hexokinase II for glucose are 10 mM and 50 μM/min, respectively. Which of the following descriptions about the kinetics of the two enzymes is most likely to be correct?
(A) Ifthe glucose concentration is 50μM, the reaction velocity of hexokinase I will be ~20 uM/min.
(B) If the glucose concentration is 50 μM, the reaction velocity of hexokinase I will be ~25 uM/min.
(C) If the glucose concentration is 1.0 mM, the reaction velocity of hexokinase II will be ~30 μM/min
(D) Ifthe glucose concentration is 30 mM, the reaction velocity of hexokinase II may reach 50 μM/min.
(E) Compared to hexokinase II, hexokinase I is more efficient when the glucose concentration is higher than 10 mM.