Which one of the following types of mechanisms is not known to play a role in the reversible alteration of enzyme activity?
A) Activation by cleavage of an inactive zymogen
B) Allosteric response to a regulatory molecule
C) Alteration of the synthesis or degradation rate of an enzyme
D) Covalent modification of the enzyme
E) Interactions between catalytic and regulatory subunits
Correct Answer:
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