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Liña 24:
{{Main|adenosine triphosphate}}
ATP<sup>4−</sup> + H<sub>2</sub>O
[[Adenosine triphosphate]], or ATP, acts as a free energy "currency" in all living organisms. In a spontaneous dephosphorylation reaction 30.5 kJ/mol is released, which is harnessed to drive cellular reactions. Overall, nonspontaneous reactions coupled to the dephosphorylation of ATP are spontaneous, due to the negative free energy change of the coupled reaction. This is important in driving oxidative phosphorylation. ATP is dephosphorylated to ADP and inorganic phosphate.<ref>{{cite web|last=Casiday|first=Rachel|title=Energy for the Body: Oxidative Phosphorylation|url=http://www.chemistry.wustl.edu/~edudev/LabTutorials/Cytochromes/cytochromes.html|accessdate=5 April 2013}}</ref>
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