Refer to the Biochemistry in Focus section of your text for this chapter to answer this question. Which of the following mutations in muscle glycogen phosphorylase could result in a condition similar to McArdle disease?

a. Protein phosphatase 1 cannot dephosphorylate the mutant muscle glycogen phosphorylase.
b. Mutant muscle glycogen phosphorylase is unable to bind to glucose 6-phosphate.
c. Mutant muscle glycogen phosphorylase is unable to bind to AMP.
d. Mutant muscle glycogen phosphorylase is unable to convert to the b form.