Light-dependent reaction

Definition

The light-dependent reaction is the first phase of photosynthesis where solar energy is converted into chemical energy in the form of ATP and NADPH. It occurs in the thylakoid membranes of chloroplasts.

5 Must Know Facts For Your Next Test

1. Light-dependent reactions take place in the thylakoid membranes of chloroplasts.
2. The main products are ATP and NADPH, which are used in the Calvin cycle.
3. Water molecules are split (photolysis) to release oxygen as a byproduct.
4. Photosystems I and II play crucial roles in capturing light energy.
5. Electron transport chains are involved in generating a proton gradient for ATP synthesis.

Review Questions

Related terms

Calvin Cycle:

The second phase of photosynthesis that uses ATP and NADPH to convert CO2 into glucose.

Photosystem II:

A protein complex that captures photons and uses the energy to extract electrons from water molecules.

Electron Transport Chain:

A series of proteins in the thylakoid membrane that transfer electrons and generate a proton gradient for ATP production.