Question: Which one of the following statements about the control of enzyme activity by phosphorylation is correct?

Options

A : Phosphorylation of an enzyme results in a conformational change

B : Phosphorylation of an enzyme occurs only at specific tyrosine residues

C : Phosphorylation of an enzyme is carried out by phosphoprotein phosphatases

D : Enzyme control by phosphorylation is irreversible

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