Question

In Krebs cycle, malate hands over hydrogen to

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

Answer 1

Answer: (A)

NAD${}^{+}$

The last step of Krebs cycle is a dehydrogenation reaction which restores oxaloacetic acid by removing a pair of hydrogen atoms from malate with the help of an enzyme malate dehydrogenase. The pair of hydrogen atoms pass two electrons and one proton to NAD+, forming NADH + H+.

Thus, the correct answer is option A.