Discussion
Reversible covalent modification involves
Answer: A
Correct answer: Activation of proenzymes
Reversible covalent modification - phosphorylation above all - switches enzymes on and off by attaching and removing a group. Many proenzymes are activated in this way, and the modification can be undone by the opposing enzyme, a phosphatase. (Activation by cleavage, as with pepsinogen, is the irreversible kind.)
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