Which Statement Is TRUE for Glycogen Phosphorylase B?
A) It $\alpha$

Multiple Choice

Which statement is TRUE for glycogen phosphorylase b?

A) It catalyzes a phosphorylytic cleavage of $\alpha$ (1 $\rightarrow$ 6) glycosidic bonds.
B) It catalyzes a hydrolytic cleavage of $\alpha$ (1 $\rightarrow$ 4) glycosidic bonds.
C) It is regulated both allosterically and via covalent modification.
D) It uses UDP-glucose as a substrate.
E) It is an important blood glucose sensor in myocytes.