Enzymes not used in glycogen metabolism: (A) Glycogen phosphorylase B, (B) Glycogen synthase I, (C) Glycogen synthase C, (D) Glycogen synthase D
Answer is C. The liver phosphorylase-b is the inactive form. It becomes active on phosphorylation. The active form is phosphorylase-a.Glycogen synthase exists in two distinct forms that can be interconveed by the action of specific enzymes; active dephosphorylated glycogen synthase(glucose-6-p-independent) and less active, phosphorylated glycogen synthase D(glucose-6-p-dependent.Ref: DM Vasudevan, page no: 127