Question

Question 6 (1 point) Saved Choose all of the following that are characteristics of glycogen phosphorylase 1) phosphorylase a forms in a reaction that requires a cofactor 2) phosphorylated form is phosphorylase b 3) net phosphorylase b forms in a reaction catalyzed by a phosphatase phosphorylation increase catalytic activeiy 5) the phosphorylated form is phosphorylase a 6) stimulatio )stimulation of the kinase increase the ratio of phosphorylase a and phosphorylase b. C,J 7) the reaction that form phosphorylase b increases the rate of net glycogen breakdown

Answer 1

Calcium is the cofactor of phosphorylase b kinase phosphorylase a is phosphorylated, phosphorylation of phosphorylase b increases catalytic activity, stimulation of kinase increases the ratio of phosphorylase a to phosphorylase b ( since phosphorylase a is the phosphorylated form) phosphorylase b is formed by removing phosphate on phosphorylase a.

so the correct statements are

1) phosphorylase a, forms in a reaction that requires a cofactor.

2) net phosphorylase b forms in a reaction catalysed by a phosphatase.

3) phosphorylation increases catalytic activity

4) the phosphorylated form is phosphorylase a

5) stimulation of kinase increases the ratio of phosphorylase a to phosphorylase b.