Lecture 11 - 012811

Lecture 11 - 012811 - Lecture 11 hloroplast and...

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Unformatted text preview: Lecture 11 hloroplast and Photosynthesis (II) 1 Summary: Z scheme of photosynthesis 2 3 Andre Jagendorf’s demonstration 4 ATP formation is driven by a proton-motive force ¾ Thylakoid membrane is permeable to Cl- and Mg 2+ ¾ Electrical neutrality is maintained ¾ [H + ] has a major contribution to proton-motive force ¾ pH difference = 3.5 => proton-motive force=0.20V or Δ G=-20.0 kJ/mol (how to calculate?) 5 Cyclic photophosphorylation ¾ When NADPH/NADP + is high, not enough NADP + to accept e- ¾ Only PSI involved 6 Cyclic photophosphorylation ¾ No NADPH is generated ¾ Proton gradient => ATP synthesis ¾ No O 2 is formed 7 Electrons from PSII to PSI: both need light Stroma e — Thylakoid Lumen How much is sunshine worth? 12 H + 12 H + 3 ATP 8 Electrons come from H 2 O And H + pumped Stroma Split Water Pump H + Thylakoid Lumen 12 H + 12 H + 3 ATP 9 Protons drive ATP Synthase Stroma Proton gradient drives ATP synthase Thylakoid Lumen 12 H + 12 H + 3 ATP 10 How much is sunshine worth?How much is sunshine worth?...
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This note was uploaded on 08/15/2011 for the course CHEM 114B taught by Professor Wang during the Spring '09 term at UCSD.

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Lecture 11 - 012811 - Lecture 11 hloroplast and...

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