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PHOTOSYNTHESIS - 1 Ferredoxin(Fe 2 Plastoquinone 3...

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PHOTOSYNTHESIS: THE LIGHT REACTIONS I. Overview A. By 1940 generalized equation for photosynthesis established nCO 2 +2nH 2 O + light → (CH 2 O ) n + nO 2 + nH 2 O 1) Light required 2) Chlorophyll in chloroplasts 3) Oxygen from water 4) Carbohydrates produced B. In 50's functions of light in photosynthesis established 1) Drive electrons from water to reduce NADP + to NADPH (a) Reducing power to fix CO 2 2) Provide energy to form ATP via photophosphorylation (a) ADP + Pi + light → ATP + H 2 O II. Photosystem I (MAKING ATP VIA CYCLIC ELECTRON TRANSPORT) A. P700 Reaction Center B. Electron transport chain (Chemiosmotic phosphorylation)
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Unformatted text preview: 1) Ferredoxin (Fe) 2) Plastoquinone 3) Cytochrome 4) Plastocyanin C. P700 1 III. Photosystem II (PLANTS NEED REDUCING POWER) A. Electrons / Hydrogen (RP) must come from water - P700 not strong enough oxidant to be reduced by water. 1) Water is cheep - get rid of its byproduct. B. P680 Reaction Center and NON-CYCLIC ELECTRON TRANSPORT 1) Electron to primary acceptor (Phaeophytin) 2) Plastoquinone 3) Cytochrome 4) Plastocyanin 5) P700 6) Ferredoxin (Fe)NADP → NADPH 2 THE Z-SCHEME (Putting it all together) 3...
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