Quiz 12 Glycogenesis Glycogenolysis

Is glycogen phosphorylase activated, inhibited, or unaffected in response to a glucagon signal in liver tissue?

activated

Which statement is true of the glycogen branching enzyme?

It catalyzes the formation of ______ linkages during glycogen synthesis

(a1 → 6)

Which substance activates glycogen synthase b in liver?

both insulin and glucose 6-phosphate

he enzyme________ catalyzes a cleavage of (α1 → 4) bonds.

glycogen phosphorylase

Which statement is true of glycogen synthase?

It catalyzes addition of glucose residues to the nonreducing end of a glycogen chain by formation of ______

(a1 → 4) bonds

The _____ tissues do NOT contribute glucose to the blood because they lack the enzyme _____.

muscle and adipose, glucose-6-phosphatase

In glycogen _____ glycosidic bonds occur at branch points, while all others are _____ glycosidic bonds.

(a1 → 6); (a1 → 4)

Which statement describes possible fates for glucose 1-phosphate in skeletal muscle?

Glucose 1-phosphate can be the substrate for _______ to make substrate for glycogen synthase.

UDP-glucose pyrophosphorylase

The action of which three enzymes are needed to release glucose from the outer branches of glycogen so that it may be used in glycolysis?

glycogen phosphorylase; glycogen debranching enzyme; phosphoglucomutase

is the primer on which new glycogen chains are initiated

Glycogenin: