MCAT Biochemistry Question 18: Answer and Explanation

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Question: 18

3. Some enzymes require the presence of a nonprotein molecule to behave catalytically. An enzyme devoid of this molecule is called a(n):

  • A. holoenzyme.
  • B. apoenzyme.
  • C. coenzyme.
  • D. zymoenzyme.

Correct Answer: B

Explanation:

An enzyme devoid of its necessary cofactor is called an apoenzyme and is catalytically inactive.

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