Question

what is the function of cofactor nad⁺?
a) it acts as a proton transporter
b) it transfers zn²⁺ to adh
c) it acts as an electron transporter or electron acceptor
d) it transfers a chemical group from ethanol to adh

Explanation:

NAD⁺ (nicotinamide adenine dinucleotide) is a key coenzyme in cellular metabolism. Its primary role is to accept electrons (and a proton) from oxidized molecules, becoming NADH, which then carries these electrons to the electron transport chain for energy production. Option a is incorrect as it does not function as a proton transporter alone; option b is wrong because it does not transfer Zn²⁺ to ADH; option d is incorrect as it does not transfer chemical groups from ethanol to ADH (ADH uses NAD⁺ to oxidize ethanol, with NAD⁺ accepting electrons).

Answer:

c) It acts as an electron transporter or electron acceptor