Which of the following is listed as an input to the Electron Transport Chain?

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Multiple Choice

Which of the following is listed as an input to the Electron Transport Chain?

Explanation:
The main idea is that the Electron Transport Chain is fed by reduced electron carriers, NADH and FADH2. These molecules deliver high-energy electrons to the chain, which powers proton pumping and drives ATP synthesis. Across one glucose molecule, glycolysis, pyruvate oxidation, and the Krebs cycle together produce 10 NADH and 2 FADH2 that feed into the chain. NADPH is used for biosynthetic reductions, not the ETC; CO2 is a waste product released from the Krebs cycle; and ATP is a product of oxidative phosphorylation, not an input. Oxygen serves as the final electron acceptor, forming water.

The main idea is that the Electron Transport Chain is fed by reduced electron carriers, NADH and FADH2. These molecules deliver high-energy electrons to the chain, which powers proton pumping and drives ATP synthesis. Across one glucose molecule, glycolysis, pyruvate oxidation, and the Krebs cycle together produce 10 NADH and 2 FADH2 that feed into the chain. NADPH is used for biosynthetic reductions, not the ETC; CO2 is a waste product released from the Krebs cycle; and ATP is a product of oxidative phosphorylation, not an input. Oxygen serves as the final electron acceptor, forming water.

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