atp definition biology
atp adenosine 5 triphosphate a nucleotide that is the most important molecule for capturing and trans ferring free energy in cells hydrolysis of each of the two high energy phosphoanhydride bonds in atp is accompanied by a large free energy change Î´g of 7 kcal moletp synthase a molecular motor atp synthase dalton s embedded in the inner membrane of mitochondria its function is to convert the energy of protons h+ moving down their concentration gradient into the synthesis of atp