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The electron transport chain is able to pump protons across the inner membrane, because of the energy released by high-energy electron carriers produced in the Krebs cycle. The high-energy electron carriers are oxidized by complexes of the electron transport chain.

Match the correct electron transport protein complex with the reduced electron carrier that it oxidizes.

A

Complex I oxidizes ${NAD}^+$ and complex II oxidizes $FAD$.

B

Complex I oxidizes $FAD$ and complex II oxidizes ${NAD}^+$.

C

Complex I oxidizes $NADH$ and complex II oxidizes ${FADH}_2$.

D

Complex I oxidizes ${FADH}_2$ and complex II oxidizes $NADH$.

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