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15 Cards in this Set
- Front
- Back
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Light reaction
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takes place in photosystems in thylaakoid membrane
generates ATP and increases potential energ of electrons by moving them from H[2]O to NADPH |
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Electrons excitation produces energy
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Photosystem
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reaction-center complex surrounded by light-harvesting complexes
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Reaction-Center
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where primary electron acceptor accepts excited electron from chlorophyll a
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Light-Harvesting complexes
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funnel energy of photons to reaction center
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Photosystem II
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best at absorbing wavelengths of 680nm (functions first)
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P680
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reaction-center chlorophyll a of PSII
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Photosystem I
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best at absorbing wavelength of 700nm
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P700
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reaction-center chlorophyll a of PSI
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2 Routes of Electron flow?
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1. Linear electron flow
2. Cyclic Electron flow |
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Linear electron flow
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primary pathway that involves both photosystems to produce ATP and NADPH using light energy
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Linear Electron Flow Steps
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(look at set)
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Cyclic Electron Flow
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Only uses PSI and produces only ATP; no NADPH
believed to have evolved before linear electron flow (some organisms only have PSI) |
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Cyclic Electron Flow steps
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1. electron flow generates surplus ATP, satisfying higher demand in Calvin cycle
picture |
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Chloroplast vs. Mitochondria: Chemiosmosis
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• Generates ATP from different sources
Mitochondria = food Chloroplasts = light • Proton travel Mitochondria = into intermembrane space and drive ATP synthesis as diffues back into mitcohondrial matrix Chloroplast = into thylakoid space and drives ATP synthesis as the diffuse back into stroma |
