Which One of the Following Statements About Mammalian Glycogen Synthase

Multiple Choice

Which one of the following statements about mammalian glycogen synthase is not correct?

A) It is especially predominant in liver and muscle.
B) The donor molecule is a sugar nucleotide.
C) The phosphorylated form of this enzyme is inactive.
D) This enzyme adds glucose units to the nonreducing end of glycogen branches.
E) This enzyme adds the initial glucose unit to a tyrosine residue in glycogenin.