Final answer:
NAD+ and NADP+ are coenzymes involved in oxidation-reduction reactions. NAD+ functions in food oxidation, while NADPH participates in fatty acid and cholesterol synthesis.
Step-by-step explanation:
Nicotinamide adenine dinucleotide (NAD+) and Nicotinamide adenine dinucleotide phosphate (NADP+) are coenzymes involved in numerous oxidation-reduction reactions. They act as electron acceptors during the enzymatic removal of hydrogen atoms. NAD+ functions as a coenzyme for dehydrogenases involved in the oxidation of various food substances, while NADPH acts as a coenzyme for reductases participating in the synthesis of fatty acids and cholesterol.