Aerobic dehydrogenase in biological oxidation contains:
- NAD
- NADH
- NADP
- FMN & FAD
The Correct Option is D
Solution and Explanation
Dehydrogenases are grouped by where in the respiratory chain they hand off electrons. Anaerobic dehydrogenases use NAD or NADP as coenzyme and must pass electrons along a chain of carriers before oxygen is reduced, so they cannot act on oxygen themselves. Aerobic dehydrogenases, by contrast, carry flavin prosthetic groups, FMN or FAD, that are reactive enough to reduce oxygen directly to hydrogen peroxide without any intermediate carrier.
Checking the options against this rule: NAD and NADH both belong to the pyridine-linked, oxygen-independent group, and NADP follows the same pattern since it is chemically a phosphorylated form of NAD used mainly in biosynthesis. Only FMN and FAD have the flavin ring system that lets them react with molecular oxygen directly.
Therefore, the correct answer is FMN & FAD.
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