The Glycogen Phosphorylase Enzyme
A) Makes $\alpha$ (1,4) Links at the Nonreducing End of Glycogen

The glycogen phosphorylase enzyme

A) makes $\alpha$ (1,4) links at the nonreducing end of glycogen.
B) uses P_i (phosphate) as a nucleophile in the cleavage of glucose units off of the glycogen chain.
C) cleaves the $\alpha$ (1,6) linkages of glucose units in the glycogen polymer.
D) releases free glucose units as its immediate product.