Question

When succinate is oxidized in Krebs cycle, it's hydrogen is accepted by

• A. NAD${}^{+}$
• B. FAD
• C. FMN
• D. Fumarate

Answer 1

Answer: (B)

FAD

The sixth step of Krebs cycle converts succinate into 4-carbon fumarate with the aid of an enzyme succinate dehydrogenase and liberates a pair of hydrogen atoms. The latter pass to FAD forming FADH2.

Thus, the correct answer is option B.