MCDB 310 Lecture Notes - Lecture 21: Electrochemical Gradient, Atp Synthase, Electron Donor

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Photophosphorylation: the process by which sunlight drives electron transfers, powering atp synthesis using a h+ gradient. Important chloroplast anatomy: stroma: mitochondrial matrix, thylakoids: complex membrane system that forms flattened sacks, thylakoids will stack like pancakes to form grana. Exciton transfer: the photophosphorylation oxidation reduction reaction: chlorophyll in solution absorbs sunlight energy, loses it rapidly as heat or fluorescence, light harvesting chlorophyll molecules in reaction centers efficiently transfer energy (very little loss, 1. One molecule absorbs a photon of light (exciton) and is excited: 2. Energy is randomly transferred to a neighboring light-harvesting molecule, exciting it first one returns to the ground state: process continues as exciton transfer until exciting a specialized pair of chlorophyll a at the reaction center. Reaction centers: bacterial type ii, bacterial type i, plant reaction center (ii-i in series) Bacterial photochemical reaction centers: pheophytin-quinone reaction centers (type ii)

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