BIOS 2011 Lab 2 Photosynthesis

Atp synthetase utilizes the proton motive force to

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Unformatted text preview: erefore christened the Z scheme (see Figure 1). Figure 1. Light Reaction Electron Transport and Proton Motive Force ATP Synthesis. Non ­cyclic photophosphorylation is performed by molecules embedded in the thylakoid membrane: chlorophylls P680 and P700, their electron transport chains and the enzymes NADP Reductase and ATP Synthetase. ATP Synthetase utilizes the proton motive force to phosphorylate ADP. Key: PP = Pheophytin, PQ = Plastoquinone, Cb6f = Cytochrome b6f complex, PC = Plastocyanin, FE ­S ­P = Iron Sulfur Proteins, FD = Ferrodoxin. Blue background = basic environment, red background = acidic environment. Exercise 2 Photosynthesis The Z ­scheme is divided into two photosystems, interconnected by an electron transport chain. The existence of two photosytems facilitates a much more efficient harvesting of the light energy available to the p...
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