Question

Which is a coenzyme?

• A. Protein
• B. ${NAD}^{+}$
• C. Zinc
• D. Copper

Answer 1

The correct option is B ${NAD}^{+}$

NAD is known as nicotinamide adenine dinucleotide. It is a dineucleotide which has two dineucleotide joined by phosphodiester bond. It is a coenzyme found in all living cell. NAD${}^{+}$ acts a electron acceptor in metabolic reaction. During glycolysis, it accepts the electron and changes to NADH which is further changed to ATP. One NADH produces three ATP.

So, the correct answer is option B.