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Energy is usually released from the ATP molecule to do work in the cell by a reaction that removes one of the phosphate- oxygen groups, leaving adenosine disphosphate (ADP). When the ATP converts to ADP, the ATP is said to be spent. Then the ADP is usually immediately recycled in mitochondria where it is recharged and comes out again as ATP.

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14y ago
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10y ago

From a thermodynamic point of view, the hydrolysis of ATP is exergonic (gives off energy, thermodynamically 'spontaneous'). This reaction can therefore be coupled with an endergonic (non-spontaneous) one. If the combined reaction is endergonic, the reaction will take place.

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Q: How does ATP couple exergonic and endergonic reactions?
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