Inner membrane Chloroplast - Estrella Mountain Community ......2 e– Plastoquinone Photon Excited reaction center the thylakoid membrane. The proton Excited reaction center Antenna
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2. The electrons pass through the b6-f complex, which uses the energy released to pump protons across the thylakoid membrane. The proton gradient is used to produce ATP by chemiosmosis.
3. A pair of chlorophylls in the reaction center absorb two photons. This
excites two electrons that are passed to NADP+, reducing it to NADPH. Electron transport from photosystem II replaces these electrons.
H2O
H+ PC
Fd
2H+ + 1/2O2
NADP+ + H+ NADPH
2
2
2
2
2
1. A pair of chlorophylls in the reaction center absorb two photons of light. This excites two electrons that are transferred to plastoquinone (PQ). Loss of electrons from the reaction center produces an oxidation potential capable of oxidizing water.
1. Photosystem II absorbs photons, exciting electrons that are passed to plastoquinone (PQ). Electrons lost from photosystem II are replaced by the oxidation of water, producing O2
2. The b6-f complex receives electrons from PQ and passes them to plastocyanin (PC). This provides energy for the b6-f complex to pump protons into the thylakoid.
3. Photosystem I absorbs photons, exciting electrons that are passed through a carrier to reduce NADP+ to NADPH. These electrons are replaced by electron transport from photosystem II.
4. ATP synthase uses the proton gradient to synthesize ATP from ADP and Pi
enzyme acts as a channel for protons to diffuse back into the stroma using this energy to drive the synthesis of ATP.