During muscle contraction, which form of glycogen phosphorylase is more active and why?

• A. Phosphorylase a is more active because it favors the r state.
• B. Phosphorylase b is less active because it favors the t state.
• C. Phosphorylase b is more active because it favors the r state.
• D. Phosphorylase a is less active because it favors the t state.

Answer: (A)