Question

Blood glucose level is not dependent upon muscle glycogen, because of the absence of

• A. Phosphorylase
• B. Branching enzyme
• C. Glucose-6-phosphatase
• D. Aldolase

Answer 1

Answer: (C)

Glucose-6-phosphatase

Stores of readily available glucose to supply the tissues with an oxidizable energy source are found principally in the liver, as glycogen.

Glycogen is a polymer of glucose residues, linked by (1,4)- and -(1,6)-glycosidic bonds. A second major source of stored glucose is the glycogen of skeletal muscle.

However, muscle glycogen is not generally available to other tissues, because muscle lacks the enzyme glucose-6-phosphatase.

Glucose-6-phosphatase enzyme catalyses the conversion of glucose-6-phosphate to glucose. So, Blood glucose level is not dependent upon muscle glycogen.