Compare the role of FAD in beta oxidation and the citric acid cycle.

• A. FAD is oxidized to FADH2 in beta oxidation but not in the citric acid cycle.
• B. FAD is used to produce ATP directly in both processes.
• C. FAD is reduced to FADH2 in both processes, contributing to electron transport.
• D. FAD inhibits enzyme activity in both processes.

Answer: (C)