MCAT Biochemistry Question 24: Answer and Explanation

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Question: 24

9. Consider a reaction catalyzed by enzyme A with a K_m value of 5 × 10^–6 M and v_max of

At a concentration of 5 × 10^–4 M substrate, the rate of the reaction will be:

A. .
B. .
C. .
D. .

Correct Answer: C

Explanation:

At a concentration of 5 × 10^–4 M, there is 100 times more substrate than present at half maximal velocity. At high values (significantly larger than the value of K_m) the enzyme is at or near its v_max, which is.

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