Bio-Chemistry (M.Phil./Ph.D.) 2017 Panjab University Entrance Exam With Answers

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30.

Glycogen phosphorylase is converted to its active form ‘a’ from its inactive form ‘b’ by-

A: Proteolytic cleavage of a peptide fragment from N-terminus
B: Reversible dimerisation of phosphorylase b triggered by Ca2+ ions
C: Interaction of ATP on the allostearic site of the enzyme
D: Phosphorylation of a specific Serine residue on each subunit by ATP

The answer is: D

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