BRAINCAKECyclic Photophosphorylation
Cyclic photophosphorylation is one of two light-dependent reactions and involves photosystem I only. Light is absorbed by the chlorophyll a molecule at the reaction centre. This excites electrons which gain enough energy to leave the molecule.
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Key terms in this lesson
- ATP
- Adenosine triphosphate, the universal energy currency of cells, formed by adding an inorganic phosphate to ADP and hydrolysed to release energy for cellular reactions.
- photosystem
- A light-harvesting cluster of photosynthetic pigments in the thylakoid membrane that channels absorbed light energy to a reaction-centre chlorophyll a molecule.
- chemiosmosis
- The synthesis of ATP by ATP synthase, driven by the flow of protons down their concentration gradient across a membrane.
More in Energy for Biological Processes
- ATP
- Chloroplasts
- Photosynthetic pigments
- Photosystems
- Non-cyclic Photophosphorylation
- Chemiosmosis
- Calvin Cycle
All 8 lessons in Energy for Biological Processes · All AQA A-level Biology topics