Glucokinase Has a K_m Value of 10

question 65

Multiple Choice

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

• A) glucokinase acts on glucose at low concentrations.
• B) glucokinase acts on glucose only at high glucose concentrations.
• C) glucokinase phosphorylates most of the glucose at low glucose levels.
• D) hexokinase acts on glucose only at high levels of glucose.
• E) hexokinase acts at about half-maximal velocity at glucose concentrations of 4-5 mM.

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