UB BIO 201 - exam 2 notes (40 pages)

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exam 2 notes



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exam 2 notes

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Pages:
40
School:
University at Buffalo, The State University of New York
Course:
Bio 201 - Cell Biology

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lecture 12 02 13 2012 Light reactions Convert light energy into chemical energy stored in NADPH and ATP Water is the initial e donor to the electron transport chain water gets oxidized to O2 Dark reactions The NADPH and ATP from light reaction used to make carbs from CO2 Pathway for electron transport in chloroplast thylakoid Travels from photosystem 2 to 1 H2O PSII PQ lipid ctyb6 f PC peripheral protein PSI NADP H NADPH H2O is split in lumen to generate H in the lumen o Lumen is acidified Product is NADPH and proton gradient Stages of e flow in photosynthesis 1 Photolysis PSII using energy from light to split water 3 products o H2O H for H gradient O2 for mitochondria e for e transport 2 Pass e from PSII to PSI energy generated increases H in the lumen 3 Pass e from PSI to NADP produces NADPH electron from water is used to start this process not from the sun o sunlight is used to lyse break H2O The Z scheme for e transport in thylakoid High reduction potential low reduction potential back and forth Cannot go from high to low to pass eHave to lower reduction potential in order to pass eo Light does this P680 part of PSII P700 is part of PSI 1 Light provides the energy to split water and to lower the Eo value of P680 to excited state 2 The excited state of P680 now is low enough to pass e to PQ but now the Eo of P700 is too high to pass e further light energy at PSI is needed to lower the Eo of P700 so it can continue to pass e to NADP to make NADPH Summary of Light reactions 1 PSII P680 uses light energy to split water by photolysis H2O H O2 eo the H contributes to the H gradient in the lumen o the e are passed to the e transport chain and provides energy or more H pumping 2 Electrons passed to PQ and H go to lumen to increase H in lumen 3 Cytb6 f complex accepts e and pumps more H into the lumen 4 E passed to PC and PSI P700 5 E passed to NADP to make NADPH 6 Energy from H gradient is used to ATP in the stroma plants need water light and CO2 to grow o light to



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