Which of the following statements about enzymes is true?
A) In a human cell, one enzyme usually catalyzes no more than five different chemical reactions.
B) In a human cell, nearly all chemical reactions are catalyzed by enzymes.
C) In a human cell, enzymes must be constantly replaced as they are used up in the reactions they catalyze.
D) In a human cell, some enzymes are specialized to store activation energy.
Correct Answer:
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