Question

Coenzyme NAD and NADP contain the vitamin:
A. Niacin
B. Biotin
C. Thiamine
D. Vitamin B12
E. Vitamin A

Answer 1

Hint: Enzymes are biocatalysts which alter the rate of any chemical reaction. They may be simple protein molecules and conjugated protein molecules. The conjugated proteins also have a non-protein group. The conjugated enzyme is formed from an apoenzyme which consists only of the amino acid while a prosthetic group which is the non-protein part.

Complete answer:
To know the correct answer to the question, we must be well aware of the enzyme parts.
Holoenzyme is the enzyme molecule which consists of a protein and prosthetic group. The non-protein group of the enzyme may be a cofactor which is the inorganic part or a coenzyme which is organic in nature. NAD and NADP are the two of these coenzymes. NAD stands for Nicotinamide Adenine Dinucleotide while NADP stands for Nicotinamide Adenine Dinucleotide Phosphate. The two of these coenzymes contain the vitamin niacin.
Biotin is a water soluble vitamin found in our body which helps us obtain energy from the nutrients. Thiamine is the vitamin found in nuts, whole grain, cereals etc. It is also known as vitamin B1. Vitamin A is found in dairy products, fish etc. While vitamin B12 is found in egg, fish meat etc.

Since, now we are well aware of the coenzymes NAD and NADP, therefore the correct answer to the question is niacin.

Note: Here it must be noted that the main function of the coenzyme is to act as an electron donor or acceptor. These electrons are either added to the substrate or removed from the substrate. These coenzymes also play an important role in oxidation reduction reaction.