The light-dependent reactions of photosynthesis
In the light-dependent reactions of photosynthesis, the energy of the light is converted into chemical energy. Living beings gain portable and short-term storable chemical energy by building up units of the universal "energy currency" ATP and storing reduction equivalents in the form of NADPH.
The light-dependent reactions take place in the thylakoid.
- The proteins involved are stored in the thylakoid membrane.
- The separation of a thylakoid compartment allows the proton concentration in the lumen to increase.
- Sunlight and water enable the proteins of the thylakoid membrane to build up ATP and NADPH.
- 1.25 molecules of ATP are formed per absorbed photon (if you convert NADPH to ATP in a ratio of 1: 3).
- An important by-product of this reaction is oxygen.
- The light reactions of photosynthesis
- Photosystem I and II and the Light Reaction
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