Question

select the correct answer. in cellular respiration, where do the high - energy electrons that move through the electron transport chain originate? a. water b. nadh and fadh₂ c. nad⁺ and fad d. glucose

Explanation:

During cellular respiration, the high - energy electrons that move through the electron transport chain come from electron - carriers. NADH and FADH₂ are the reduced forms of the electron - carriers NAD⁺ and FAD respectively. These molecules are produced in glycolysis, the citric acid cycle, and other steps of cellular respiration and then donate their high - energy electrons to the electron transport chain. Water is a product of the electron transport chain, NAD⁺ and FAD are the oxidized forms of the carriers, and glucose is the starting molecule whose energy is gradually extracted to form NADH and FADH₂.

Answer:

B. NADH and FADH₂