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Unformatted text preview: over the reactants . Cells never want the _ K eq to be zero because then the forward and backward reactions are going at the same pace. In order for _ endergonic reactions , those requiring energy, to go they must be _ coupled with an exergonic reaction. The _ hydrolysis of the energy currency molecule _ ATP is often employed; it has a delta G of _-7.3 kcal/mol . This exergonic reaction can be coupled to _ exergonic (anabolic) reactions not exceeding this value.This molecule has three highly negatively charged _ phosphate groups trying to repel each other so when broken the enthalpy is greatly _ decreased . The formation of glutamine from glutamic acid and _ ammonia is an example of an endergonic reaction which is coupled. Other proteins such as transporters can be _ phosphorylated and then _ dephosphorylated with the energy of ATP hydrolysis making the transport of the ion proceed....
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- Winter '05