Which molecule is produced by the Krebs cycle and used in the electron transport chain?

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Multiple Choice

Which molecule is produced by the Krebs cycle and used in the electron transport chain?

Explanation:
NADH is produced by the Krebs cycle and used by the electron transport chain. In the cycle, acetyl-CoA is oxidized, generating reduced cofactors NADH (and FADH2) along with carbon dioxide as a waste product. The NADH then donates electrons to the electron transport chain, providing the energy to drive ATP synthesis. The other molecules don’t fit this link: ATP is mainly produced during the electron transport chain, CO2 is released as a waste product of the cycle, and O2 is the final electron acceptor in the chain, not produced by the Krebs cycle.

NADH is produced by the Krebs cycle and used by the electron transport chain. In the cycle, acetyl-CoA is oxidized, generating reduced cofactors NADH (and FADH2) along with carbon dioxide as a waste product. The NADH then donates electrons to the electron transport chain, providing the energy to drive ATP synthesis. The other molecules don’t fit this link: ATP is mainly produced during the electron transport chain, CO2 is released as a waste product of the cycle, and O2 is the final electron acceptor in the chain, not produced by the Krebs cycle.

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