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, which releases energy for cellular reactions when hydrolysed to ADP and inorganic phosphate.
- Thylakoid
- A flattened, membrane-bound disc within a chloroplast, stacked into grana, where the light-dependent reactions of photosynthesis occur.
- Chlorophyll
- The main photosynthetic pigment, which absorbs light energy, exciting electrons that are used in the light-dependent 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 using the energy of a proton (hydrogen ion) 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 OCR A-level Biology topics