Which of the following enzyme is absent in muscle?
Ref: Harper's Illustrated Biochemistry, 27th edition and Lippincott !s Biochemistry, 3rd editionExplanation:FATE OF MUSCLE GLYCOGENIn muscle, enzyme Glucose - 6- phosphatase is absent.This enzyme catalyzes the final step of glycogenolysis.Hence muscle glycogenolysis does not contribute to blood glucose directly.Glycogen of muscle can only be converted upto glucose - 6 - phosphate as muscle lacks glucose - 6 - phosphatase.Glucose - 6 - phosphate cannot cross the plasma membrane and enters the glycolytic cycle, where it is converted into lactic acid.This lactic acid cross the plasma membrane and reaches liver to form glucose
Glucose-1-phosphatase
Glucose 6 phosphatase
Glycogen phosphorylase
Thiophorase
Glycogen Metabolism and Glycogen Storage