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Ss AQA A-level Biology: ATP. (J What ATP is ATP stands for adenosine triphosphate. It is the immediate source of energy in cells. e202, 0,0,0 ¢ ATP is made of adenine C) Adenine Ribose Three phosphate e ribose sugar e and three phosphate groups sugar groups How ATP releases energy ATP is hydrolysed into ADP and inorganic phosphate. ATP > ADP + Pi —-@: This releases energy that can be used by the cell. Uses of ATP active transport e re id g . muscle contraction a § protein synthesis it: DNA replication e ° ee phosphorylation of molecules maintaining ion gradients Why ATP is useful ; releases energy in small manageable amounts 0 ™ ¥ O rapidly regenerated e AS es soluble transfers energy directly to reactions Exam tip Don’t say ATP stores lots of energy. Say it is the immediate energy source for cells. 
