Which statement BEST describes the electron transport chain? A) It is a series of protein complexes that transfer electrons from NADH and FADH₂ to oxygen. B) It is another name for the citric acid cycle. C) It is the same thing as catabolism. D) It is cyclic, where the same oxygens are used over and over to transport electrons. E) All of the above describe this chain.

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The electron transport chain is a series of protein complexes located in the inner mitochondrial membrane that transfer electrons from electron donors like NADH and FADH2 to oxygen, which is the final electron acceptor. This process generates a proton gradient across the membrane, which is used to produce ATP.

Which Statement BEST Describes the Electron Transport Chain