MCAT Biochemistry Question 23: Answer and Explanation

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Question: 23

8. 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^–6 M substrate, the rate of the reaction will be:

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

Correct Answer: A

Explanation:

As with the last question, relationships are important. At a concentration of 5 × 10^–6 M, enzyme A is working at one-half of its v_max because the concentration is equal to the K_m of the enzyme. Therefore, one-half ofis, which corresponds to choice (A).

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