Which two molecules are reduced in the Krebs cycle?

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Multiple Choice

Which two molecules are reduced in the Krebs cycle?

Explanation:
In the Krebs cycle, electrons are transferred to two main carriers: NAD+ and FAD, which are reduced to NADH and FADH2. NADP+ is not involved in this cycle; it’s used in other pathways like photosynthesis and biosynthetic reactions. The reduction of NAD+ occurs at several steps (donating electrons and protons to form NADH), and FAD is reduced to FADH2 during the succinate-to-fumarate step. These reduced carriers then feed electrons into the electron transport chain to generate ATP.

In the Krebs cycle, electrons are transferred to two main carriers: NAD+ and FAD, which are reduced to NADH and FADH2. NADP+ is not involved in this cycle; it’s used in other pathways like photosynthesis and biosynthetic reactions. The reduction of NAD+ occurs at several steps (donating electrons and protons to form NADH), and FAD is reduced to FADH2 during the succinate-to-fumarate step. These reduced carriers then feed electrons into the electron transport chain to generate ATP.

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