How does covalent regulation affect the activity of glycogen phosphorylase?

• A. Covalent regulation is unrelated to enzyme activity.
• B. Covalent regulation involves phosphorylation, which can activate or deactivate the enzyme.
• C. Covalent regulation is responsible for the synthesis of glycogen.
• D. Covalent regulation involves binding of allosteric effectors to change enzyme activity.

Answer: (B)