Question

which of the following is an energy carrier molecule that helps in redox reactions?
nadh
adp
ribose
co₂

Explanation:

NADH (nicotinamide - adenine dinucleotide) is an energy - carrying molecule involved in redox reactions. It can accept and donate electrons. ADP (adenosine diphosphate) is related to energy transfer in ATP - ADP cycle but not directly in redox as an energy carrier like NADH. Ribose is a sugar molecule and not an energy - carrier for redox reactions. CO₂ is a product of many metabolic reactions and not an energy - carrier for redox.

Answer:

A. NADH