Question

Which of the following is the most common ${{H}^{+}}$ acceptor?
A. FAD and $NA{{D}^{+}}$
B. FMN and $NA{{D}^{+}}$
C. FMN and FAD
D. $NA{{D}^{+}}$ and $NAD{{P}^{+}}$

Answer 1

The word hydrogen acceptor refers to a molecule that accepts hydrogen and reacts with them to reduce itself with the help of a reduction reaction. These hydrogen acceptors play a very important role in the process of photosynthesis. The hydrogen acceptors are mostly coenzymes.

Complete answer:
Photosynthesis is a biological process in which the complex molecules are broken down into simpler substances to obtain energy with the help of carbon dioxide and water. The process of photosynthesis involves the process of photophosphorylation. Phosphorylation of ADP to form ATP using the energy of sunlight during photosynthesis is called photophosphorylation. It is further categorized as cyclic photophosphorylation and non-cyclic photophosphorylation. During photophosphorylation, a high-energy electron donor and a lower-energy electron acceptor are produced using light energy and thus it is transferred through an electron transport chain (ETC). The term NAD stands for nicotinamide adenine dinucleotide and NADP stands for nicotinamide adenine dinucleotide phosphate. Both of them are the most common and best hydrogen acceptors. NAD and NADP both act as coenzymes during the process of photosynthesis. $NA{{D}^{+}}$ after accepting hydrogen atom becomes NADH and $NAD{{P}^{+}}$ after accepting the hydrogen atom is reduced to NADPH2. The term NADH stands for substance, nicotinamide adenine dinucleotide hydride. The term NADPH represents nicotinamide adenine dinucleotide phosphate.

So, option D is the correct option.

Note: NAD and NADP coenzyme functions or become activated only after getting attached with protein. They regulate the function of many biological reactions in the body of plants and animals. NADP acts as a final electron acceptor in the process of photosynthesis.