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

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

(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

The question was asked in a job interview.

My question is taken from Regulation of Metabolic Pathways topic in portion Principles of Metabolic Regulation: Glucose and Glycogen of Biochemistry

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Right answer is (a) Phosphorylation of an enzyme results in a conformational change

Best explanation: Phosphorylation of enzyme is reversible; phosphorylation is not carried out by phosphoprotein phosphatases.

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