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Energy160-page8 - loss of one or more electrons A reduction...

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Energy Flow in Cells - 8 The electron carrier molecules can capture energy released in exergonic reactions and transport it to endergonic reactions so that energy needed to cell work can be controlled and useful, rather than wasted. Often they are described as stair steps, because they can release energy step-by-step along their pathway. Oxidation-Reduction and Metabolism Since energy changes in cells involve energy transfers, oxidation-reduction reactions are important. It can be useful to review them. An oxidation is the
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Unformatted text preview: loss of one or more electrons. A reduction is the gain of one or more electrons. Oxidations and reductions are always coupled and are useful in controlling the energy released from an exergonic chemical reaction so that it can be made available for cell work. In many cell oxidation-reduction reactions, the electron oxidized is associated with a hydrogen atom, so gaining and losing hydrogens and their electrons is something we will often see in metabolic pathways, such as cell respiration and photosynthesis....
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