BIOS41_Lecture20_03142008

BIOS41_Lecture20_031 - be funneled into an adjacent protein complex in the membrane – the reaction center as shown in the next figure

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BIOS 41 Biology Core I: Cellular and Molecular Spring 2008 Professor J. A. Sands Lecture 20, March 14 Energy Transformations and Chloroplasts (Chapter 14, pages 478-486)
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14_29_chloroplasts.jpg Photosynthesis takes place in chloroplasts.
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14_31_mito_chloroplas.jpg Similarities and differences between mitochondria and chloroplasts.
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14_32_photsyn_react.jpg Two broad categories of photosynthetic reactions take place in chloroplasts.
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14_33_Chlorophyll.jpg Chlorophyll A magnesium atom is held in the center of the porphyrin ring. Light is absorbed by electrons within the bond network shown in blue. The hydrophobic tail holds the chlorophyll in the thylakoid membrane. In thylakoid membranes, chlorophylls are held in large multiprotein complexes called photosystems. The antenna portion of a photosystem consists of hundreds of chlorophylls, arranged to allow the absorbed energy to
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Unformatted text preview: be funneled into an adjacent protein complex in the membrane – the reaction center, as shown in the next figure. 14_34_photosystem.jpg A photosystem contains a reaction center and an antenna. Traps energy funneled into reaction center from antenna. Passes high energy electron to another molecule. Replaces lost electron with low energy electron from another molecule. Light energy drives the synthesis of ATP and NADPH. “Two different photosystems work in series. Together these photosystems impart to an electron a high enough energy to produce NADPH. Along the way, a proton gradient is also generated, allowing ATP to be made.” (page 483) 14_39_Carb_fix_cycle.jpg ATP and NADPH drive the carbon-fixation cycle (Calvin cycle). “Rubisco is widely claimed to be the most abundant enzyme on Earth.” (page 485)....
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This note was uploaded on 04/19/2008 for the course BIOS 41 taught by Professor Sands during the Spring '08 term at Lehigh University .

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BIOS41_Lecture20_031 - be funneled into an adjacent protein complex in the membrane – the reaction center as shown in the next figure

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