Question

Coenzymes NAD and NADP contain the vitamin

• A. Niacin
• B. Biotin
• C. Thiamine
• D. Vitamin $B_{12}$
• E. Vitamin $A$

Answer 1

The correct option is A Niacin

Niacin is a vitamin B${}_3$. It helps in the formation of NAD and NADP. NAD is known as nicotinamide adenine dinucleotide. It is a dinucleotide which has two dinucleotides joined by the phosphodiester bond. It is a coenzyme found in all living cell. NAD++acts an 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.

Nicotinamide adenine dinucleotide phosphate is known as NADP. It acts as an electron acceptor. The reduced form of the NADP is known as NADPH.

So, the correct answer is option A.