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What is a coupled reaction in biology?

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A coupled reaction is a reaction with a common intermediate that results in energy being transferred from one side of the reaction to the other. A common example of a coupled reaction is the formation of ATP, a nucleotide that contains chemical energy that is broken down for metabolic uses.

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ATP stores energy in the form of phosphate bonds. The energy is released when ATP is broken down into ADP. A few examples of the processes that use ATP include motility and cell division. ATP is also used as a substrate for kinases that phosphorylate proteins and lipids and by adenylate cyclase to produce cyclic AMP.

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