Final answer:
NAD and FAD are coenzymes critical for cellular energy production, derived from vitamins nicotinamide (B3) and riboflavin (B2), respectively. They participate in oxidation-reduction reactions to form high-energy molecules NADH and FADH2.
Step-by-step explanation:
The co-enzymes of NAD and FAD are derived from vitamins nicotinamide (B3) and riboflavin (B2), respectively. Nicotinamide adenine dinucleotide (NAD) is a coenzyme involved in redox reactions, carrying electrons from one reaction to another. Similarly, flavin adenine dinucleotide (FAD) is a coenzyme that is involved in various oxidation-reduction reactions and is essential for the production of energy in the form of adenosine triphosphate (ATP). Both NAD and FAD accept hydrogen atoms during these reactions and are converted to their respective reduced forms, NADH and FADH2, which are high-energy molecules that play a crucial role in cellular respiration and energy production.