Which is the oxidized form of NAD, the molecule that serves as an electron carrier during cellular respiration.Group of answer choicesNADHNAD⁺

The oxidized form of NAD (Nicotinamide adenine dinucleotide) is NAD⁺.

Explanation:

In cellular respiration and various metabolic processes, NAD functions primarily as an electron carrier. It exists in two forms: the oxidized form, NAD⁺, and the reduced form, NADH. When NAD⁺ accepts electrons (is reduced) during metabolic reactions, it becomes NADH. This reduced form then carries the electrons to other reactions, ultimately participating in the production of ATP through oxidative phosphorylation in the mitochondria. Therefore, when NAD⁺ is reduced, it gains electrons and becomes NADH, while in its oxidized state, it is represented as NAD⁺. This mechanism of oxidation and reduction is crucial for energy metabolism in cells.

Final Answer:

NAD⁺ is the oxidized form of NAD.