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ATP

OCR A-level BiologyEnergy for Biological ProcessesLesson 1 of 8

ATP is the universal energy currency in cells. It has three phosphate groups. The bonds between the three phosphate groups are unstable and have a low activation energy so can be rapidly hydrolysed. The hydrolysis reactions are energy yielding so they can be coupled with energy-requiring reactions.

Diagram

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Key terms in this lesson

Chloroplast
The organelle in plant cells that is the site of photosynthesis, containing thylakoid membranes and the stroma.
Oxidative phosphorylation
The production of ATP using the energy released as electrons pass along the electron transport chain, driving chemiosmosis in mitochondria.

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