Which of the following when absent would impair the rate-limiting step of glycogenolysis?: (A) 1,4-Glucoronosyl troanterase, (B) Glycogen synthetase, (C) Glycogen phosphorylase, (D) Phosphoglucomutase
Answer is C. The key enzyme for glycogenolysis is glycogen phosphorylase.Glycogen phosphorylase removes glucose as glucose-1- phosphate from glycogen.Alpha-1,4- glycosidic linkage in glycogen are cleaved.Ref: DM Vasudevan, 7th edition, page no: 124