Electron Transport Chain, illustration

Electron Transport Chain, illustration

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Credit: Carol and Mike Werner/SCIENCE PHOTO LIBRARY

Caption: Labelled illustration of the electron transport chain, a series of protein complexes located in the inner membrane of mitochondria. Here a series of reactions occurs in which electrons are transported to meet up with oxygen from respiration. The overall electron chain transport reaction is: 2H+ + 2e+ + 1/2O2 ---> H2O + energy. This reaction actually involves eight or more steps. A series of redux reactions moves electrons from a donor (NADH or QH2) to an acceptor (O2). A proton gradient is created across the inner membrane by three proton pumps (I -- NADH dehydrogenase, II -- succinate dehydrogenase, and IV -- cytochrome bc1 complex). The resulting proton gradient allows production of ATP via ATP synthase. This is a reversible process. Every use of the electron transport chain results in the production of three ATP molecules.

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Keywords: acceptor, adenosine diphosphate, adenosine triphosphate, adp, atp, bilipid, biology, cellular respiration, chemical, cytochrome bc1 complex, cytochrome oxidase, donor, electrochemical, electron, electron transport chain, energy, etc, fumarate, gradient, illustration, inner, ion, membrane, metabolism, mitochondria, nadh, nadh dehydrogenase, outer, proton, reaction, science, succinate, succinate dehydrogenase

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