Glucokinase Has a K_m value of 10

Glucokinase has a K_m value of 10.0 mM,whereas hexokinase has a K_m value of 0.1 mM.Which of the following is this consistent with?

A) Glucokinase acts on glucose only at high glucose concentrations.
B) Glucokinase acts on glucose at low concentrations.
C) Hexokinase acts on glucose only at high levels of glucose.
D) Hexokinase acts at about half-maximal velocity at glucose concentrations of 4-5 mM.

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