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The light-dependent reactions begin in a grouping of pigment molecules and proteins called a photosystem. Photosystems exist in the membranes of thylakoids. A pigment molecule in the photosystem absorbs one photon, a quantity or “packet” of light energy, at a time. A photon of light energy travels until it reaches a molecule of chlorophyll.
- 8.2 The Light-Dependent Reaction of Photosynthesis
The light-dependent reactions occur in the thylakoid...
- 8.2 The Light-Dependent Reaction of Photosynthesis
The light-dependent reactions begin in photosystem II. In PSII, energy from sunlight is used to split water, which releases two electrons, two hydrogen atoms, and one oxygen atom. When a chlorophyll a molecule within the reaction center of PSII absorbs a photon, the electron in this molecule attains a higher energy level.
The light-dependent reactions begin in a grouping of pigment molecules and proteins called a photosystem. There are two photosystems (Photosystem I and II), which exist in the membranes of thylakoids.
Sep 21, 2021 · The light-dependent reactions begin in a grouping of pigment molecules and proteins called a photosystem. Photosystems exist in the membranes of thylakoids. A pigment molecule in the photosystem absorbs one photon, a quantity or “packet” of light energy, at a time.
Photosynthesis takes place in two stages: light-dependent reactions and light-independent reactions (the Calvin cycle). Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH.
The light-dependent reactions occur in the thylakoid membranes of chloroplasts, whereas the Calvin cycle occurs in the stroma of chloroplasts. Embedded in the thylakoid membranes are two photosystems (PS I and PS II), which are complexes of pigments that capture solar energy.
The pigments of the first part of photosynthesis, the light-dependent reactions, absorb energy from sunlight. A photon strikes the antenna pigments of photosystem II to initiate photosynthesis.
