Which of the Following Statements About Enzymes Is True

Multiple Choice

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.