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TAMU BIOL 111 - Photosynthesis Part I
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BIOL 111 301 1st Edition Lecture 11Outline of Last Lecture I. Review quizII. GlycolysisIII. Junction ReactionsIV. Overview of the citric acid cycleV. Mitochondrial structureVI. Oxidative phosphorylationVII. How much energy (# ATP) was harvest4ed from glucose?Outline of Current LectureI. Review/PreviewII. Nature Of Light III. PigmentsIV. What happens to the absorbed light?V. Light Reactions: converting solar energy to chemical energyVI. How much energy did we harvest from the sun?Current Lecture- Review/Previewo Energy  Mattero Redox rxnso Laws of Thermodynamicso Kinetic vs. Potential energy o Follow carbons o Follow electronso Carbon cycleo Electron transport chain & chemiosmosiso ATP synthase- Nature Of Light o Form of energy on electromagnetic spectrum from 380-750 nmo Both particle and wave propertieso Wavelength = distance between crestso Energy of light = 1/wavelength, so more E, from shorter waveo Photon = discrete light particles- Pigmentso Substances that selectively absorb visible lighto Chlorophyll ao Chlorophyll bo Carotenoids- What happens to the absorbed light?o Photon hits pigment, e- excited, then falls (Fig 2.8)o Dissipation (Fig 10.11) Emit photon of light: Fluorescence Emit heat Transfer e- to other pigment: Resonance transfer- Light Reactions: converting solar energy to chemical energyo 1) Light harvesting complexes (PSII and PSI) Within thylakoid membrane Contain proteins and few 100 pigments Outer pigments absorb purple wavelengths, inner absorb red Excited e- energy transferred via resonance transfer from high E  low Eo 2) Linear electron flow—produces ATP and NADPH Photons excite e- in pigments and energy transferred to pair of chlorophyll a= P680, donates e- to a primary acceptor in the reaction complex P680 “strongest oxidizing agent in the world” Rips 2 e- from WATER (NOT light!) Water donates 2 e- to excited P680+, one by one Photons excite e- in pigments and energy transferred to P680 Water donates 2 e- to excited P680+, one by one E- “fall down” e- transport chain via redox rxns to PSI e- acceptor P700 Additional photons excite these e- Photons excite e- in pigments and energy transferred to P680 Water donates 2 e- to excited P680+, one by one E- “fall down” e- transport chain via redox rxns to PSI e- acceptor P700 Additional photons excite these e-o 3) Cyclic electron flow—Produces ONLY ATP Use PSI  Fd  cytochrome complex Creates proton gradient  ATP synthase- How much energy did we harvest from the sun?o In Linear E- Transport, 4 photons will: Oxidize 1 H2O  ½ O2 + 2H+ + 2e- Transport 2 e- from H2O  NADP+ Reduce NADP+  NADPH  to Calvin cycle Generate H+ in thylakoid space:- 2 H+ (from H2O)- 4 H+ (pumped by e- transport) Produce 1.5 ATP


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TAMU BIOL 111 - Photosynthesis Part I

Type: Lecture Note
Pages: 3
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