Explain the key role of ATP in energy coupling reactions. Provide a model showing energy before and after phosphorylation of the reactants.
Energy coupling is the process of using the energy released from exergonic reactions to drive endergonic reactions. ATP is not only a cell’s main source of power, but also responsible for energy coupling reactions. Energy is stored in the bond between the third and second phosphate in ATP, and when this bond is broken by hydrolysis [catabolic reaction], energy is released. This energy could be used to facilitate all sorts of cellular work, such as stimulate a potassium-pump to run[anabolic reaction].
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