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Unformatted text preview: O H+ H+ H+ photolysis
H2O e680 ethylakoid membrane ephotosystem II (RC = P680)
H+ NADPH photosystem I (RC = P700) NADP+ 7 3. Energy Changes
Potential to transfer energy (voids) second transport system first transport e– e– NADPH e– e– system (PHOTOSYSTEM I) (PHOTOSYSTEM II) H2O 1/2 O2 + 2H+ • 2 separate inputs of light (PS2, PS1) give eenough energy to transfer to NADPH (“charged”) ** Chemiosmotic Model of ATP Formation **
1. Water is split by photolysis photolysis H+ into thylakoid H+ compartment 2. Electron transport system pumps even more H+ even into the thylakoid compartment 3. Electrical and H+ concentration gradient = between thylakoid compartment and stroma 4. H+ flows down gradients into stroma through ATP synthase
• • (“Osmotic” diffusion of H+) Osmotic” (“chemistry” of ATP synthesis) chemistry” 5. Ion flow drives formation of ATP by ATP Synthase ATP 8 III. Light-Independent Reactions
• = Synthesis part of photosynthesis
– (likage of CO2’s!! GLC) GLC • Can proceed in the dark • Take place in the stroma • Called Calvin-Benson cycle Calvin Calvin-Benson Cycle
• Overall reactants – Carbon dioxide...
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This document was uploaded on 03/18/2010.
- Spring '09