CTools020911lecture14

CTools020911lecture14 - Lecture 14: Wednesday, February 9,...

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Unformatted text preview: Lecture 14: Wednesday, February 9, 2011 Biology 172 Todays Outline Announcements This Week in Discussion: Herbicides Quiz on lectures 11, 12, 13 Photosynthesis: Overview Light Reactions Noncyclic Electron Flow Cyclic Electron Flow Calvin Cycle Summary CO2 CALVIN CYCLE O2 [CH2O ] (sugar) NADP ADP + P i Summary Reaction of Photosynthesis- basically the reverse of cellular respiration 6 CO2 + 6 H2O + light C6H12O6 + 6 O2 - includes two sets of reactions ATP NADPH H2O Light LIGHT REACTIONS Figure 10.14 Noncyclic electron flow (Z-Scheme) during the light reactions links PSII and PSI , and generates ATP and NADPH Higher 4 Photons Energy of electron Lower Photosystem II Photosystem I produced via proton-motive force E l e c t r o n t r a n s p o r t c h a i n 4 Photons E le c t r o n t r a n s p o r t c h a i n Higher Energy of electron Lower Photon e e e Chlorophyll Pheophytin Cytochrome complex PQ E l e c t r o n t r a n s p o r t c h a i n Figure 10.11 P680 3. Electrons accepted by Pheophytin are transferred to PQ, and then passed down the electron transport chain to the cytochrome complex 2. Excited chlorophyll electrons are passed to primary electron acceptor (Pheophytin) 1. Photons of light excite electrons from photosystem (PSII ) chlorophylls Photon Stroma Photosystem II Antenna complex Thylakoid lumen (low pH) Cytochrome complex Photophos- phorylation ATP synthase Proton- motive force Figure 10.12 How a photosystem harvests light 5. The electrons are passed to the cytochrome complex 4. PQ carries electrons from PSII, along with protons from the stroma 6. The protons are released into the thylakoid lumen Higher E l e c t r o n t r a n s p o r t c h a i n Lower 2 Photons Energy of electron Chlorophyll (NADP reductase) Figure 10.13 Photosystem I (PSI) produces NADPH P700 4 Photons P680 Photosystem II Figure 10.14 The Z-Scheme Links Photosystems I and II...
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This note was uploaded on 02/13/2012 for the course BIO 172 taught by Professor Clark during the Winter '08 term at University of Michigan.

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CTools020911lecture14 - Lecture 14: Wednesday, February 9,...

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