Allosteric stimulator of glycogen phosphorylase: (A) ATP, (B) AMP, (C) Insulin, (D) Glucose-6-phosphate
Answer is B. AMP formed by degradation of ATP during muscle contraction is an allosteric activator of phosphorylase b. The calcium binds calmodulin and the complex activates phosphorylase kinase.Ref: DM Vasudevan, 7th edition, page no: 129