<prompt> Which of the following when absent would impair the rate-limiting step of glycogenolysis?1,4-Glucoronosyl troanteraseGlycogen synthetaseGlycogen phosphorylasePhosphoglucomutase  <response>: 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 