What happens to PKA's structure when cAMP binds to its regulatory subunits?

• A. The regulatory subunits phosphorylate the catalytic subunits.
• B. The entire PKA complex becomes inactive.
• C. The regulatory subunits dissociate, releasing the active catalytic subunits.
• D. The catalytic subunits bind more tightly to the regulatory subunits.

Answer: (C)