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 correct option is D $NA{D}^{+}$ and $NAD{P}^{+}$.

The best and most common hydrogen acceptor are nicotinamide adenine dinucleotide (NAD) and nicotinamide adenine dinucleotide phosphate (NADP). Both NAD and NADP are coenzyme. It functions only after attaching to a protein. They play important role in all biological reactions of plants and animals.
NAD+ + 2e- + 2H+ = NADH + H+
NADP+ + 2e- + 2H+ = NADPH + H+