Insulin causes a liver cell to convert its glycogen phosphorylase a to glycogen phosphorylase b.

Glucagon stimulates conversion of muscle glycogen phosphorylase b to muscle glycogen phosphorylase a.

Glucose stabilizes the R-state of liver glycogen phosphorylase a.

5’ AMP binds to muscle glycogen phosphorylase b and inhibits it by an allosteric mechanism.

Breakdown of glycogen in muscle produces mostly glucose, which is released into the blood.

Glycogen provides a way to store energy in tissues that consume large amounts of energy when an organism is active.

Glycogen provides a reservoir of glucose molecules that can be used to replenish the blood with glucose when food is not available.

Both the synthesis and the breakdown of glycogen are regulated.

I, II, and III

I and IV

II and III

II, III, and IV

I and II

All of these enzymes are necessary in the breakdown of glycogen into glucose-6-phosphate molecules.

Glycogen phosphorylase

Alpha-1,6-glucosidase

Glucosyltransferase

Phosphoglucomutase

glycogen phosphorylase, glycogen debranching enzyme, phosphoglutomutase

glycogen synthase, glycogen branching enzyme, UDP-glucose pyrophosphorylase

glycogen phosphorylase, glycogen branching enzyme, phosphoglutomutase

glycogen synthase, glycogen debranching enzyme, UDP-glucose pyrophosphorylase

hexokinase, glycogen synthase, phosphoglucose isomerase

Glycogen phosphorylase can not cleave the alpha-1,6-glycosidic bonds at glycogen branch points

Glycogen phosphorylase can only cleave roughly ten bonds before it runs out of energy

Glycogen phosphorylase can only cleave alpha-1,6-glycosidic bonds, and so when it reaches a branch point it stops

Glycogen phosphorylase can only cleave one glycosidic bond at which point another glycogen phosphorylase enzyme must come cleave the next one

None of these