Question

Which coenzymes are involved in oxidation-reduction reaction? A. Thiamine pyrophosphate, B. Flavin mononucleotide, C. Flavin adenine dinucleotide, D. Lipoamide, E. Nicotinamide adenine dinucleotide.

• A. B, D only
• B. A, C, E only
• C. B, C, E only
• D. C, D, E only

Hint:

Important redox coenzymes are NAD, FAD, and FMN. They carry electrons or hydrogen atoms during metabolism.

Answer 1

The Correct Option is C

Concept:
Oxidation-reduction reactions involve transfer of electrons or hydrogen atoms. Many coenzymes act as electron carriers.

Step 1: Check FMN.
Flavin mononucleotide is involved in redox reactions because it can accept and donate electrons. \[ B \text{ is correct} \]

Step 2: Check FAD.
Flavin adenine dinucleotide is also a redox coenzyme. It participates in many oxidation-reduction reactions. \[ C \text{ is correct} \]

Step 3: Check NAD.
Nicotinamide adenine dinucleotide is a major hydrogen and electron carrier in metabolism. \[ E \text{ is correct} \]

Step 4: Check TPP and lipoamide.
Thiamine pyrophosphate is mainly involved in decarboxylation and aldehyde transfer. Lipoamide is involved in acyl group transfer and redox in some complexes, but in this matching context the standard redox carriers are FMN, FAD, and NAD. Thus, the correct answer is: \[ B,\ C,\ E \text{ only} \] \[ \therefore \text{Correct Answer is (C)} \]