The plant mitochondrial electron transport chain consists in part of several substrate dehydrogenase complexes that reduce a common pool of membrane lipid ubiquinone. This pool of ubiquinone is oxidized either by cytochrome-cytochrome oxidase or by the alternative pathway that terminates with the alter native oxidase. Both oxidases form water from oxygen. The differences between the cytochrome and alternative pathway are the relative amounts of ATP and heat
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