複選題68. Which of the following statements about glycogen is FALSE? (A) Glucose-6-phosphate is released from nonreducing ends of the glucose polymer by the action of the enzyme glycogen phosphorylase. (B) In glycogen breakdown, it involves sequential phosphorolytic cleavages of α(1→4) bonds. (C) Glycogen is the storage polysaccharide in skeletal and liver cells. (D) Glycogen is a polymer of glucose in α(1→4) linkages with α(1→6) linked branches. (E) The breakdown of glycogen in skeletal muscle ultimately enters glycolysis to generate ATP.