Respiration160-page10 - contribution to the understanding...

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Cell Respiration - 10 Electron Transport Chain The enzymes, proteins and electron carriers needed to do electron transport are found in the inner membranes of the mitochondria. ATP is produced by using a H + concentration gradient to run the ATP synthesis pumps as electrons are passed along the electron transport molecules in a series of oxidations and reductions. As the electrons are passed from one carrier to the next, the energy released is used to move H + ions from the mitochondrial matrix through the inner membrane into the intermembrane space of the mitochondrion. As the H + concentration builds, it provides a H + gradient that passes through a protein channel pore in the membrane that works with the enzyme, ATP synthase, to generate ATP in the mitochondrial matrix. Peter Mitchell won the 1978 Nobel prize in chemistry "for his
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Unformatted text preview: contribution to the understanding of biological energy transfer through the formulation of the chemiosmotic theory". ATP is synthesized in the thylakoid membranes of the chloroplast by a similar mechanism. The Electron Transport Chain The Electron carriers, FADH 2 and NADH, produced in the Krebs cycle (and in glycolysis), provide the electrons and hydrogen needed for ATP synthesis. Oxygen is required as the final electron (and hydrogen) acceptor, producing water as the end product of aerobic cellular respiration. The H + and e-passed through the carriers combine with oxygen in the final step. (Recall that CO 2 is also a product of aerobic cellular respiration.) Chemiosmosis in the Mitochondria...
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