100cps6.s09 - Biochemistry Molecular Biology 100C Problem Set#6 due 1(a Why does a solution of chlorophyll appear green when illuminated with white

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Biochemistry & Molecular Biology 100C Problem Set #6 due: May 27, 2009 1. (a) Why does a solution of chlorophyll appear green when illuminated with white light? (b) Solutions of chlorophyll fluoresce and warm up when illuminated with 450 nm light. Why? (c) In contrast to chlorophyll in solution, chlorophyll in intact spinach leaves does not fluoresce when illuminated. What is the significance of this observation? 2. Photosynthetic green bacteria do not use water as electron donor and do not evolve O 2 upon illumination. Rather, they use H 2 S (and evolve elemental sulfur) as electron donor to the oxidized P 840 bacterial chlorophyll special-pair. (a) Write the electrochemically balanced reaction for NADH-yielding photoelectron transport by green bacteria. (b) Calculate E 0 ´(rxn) for this process. (c) Calculate ΔG°´(rxn) for this process. (d) If two infrared photons of wavelength 840 nm are harvested per photoelectron then transported, calculate the total amount of light energy adsorbed per NADH synthesized. (e) Do your results for parts (c) and (d) reveal why H
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This note was uploaded on 03/16/2010 for the course BIOC 100A taught by Professor Harrynoller during the Winter '10 term at University of California, Santa Cruz.

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100cps6.s09 - Biochemistry Molecular Biology 100C Problem Set#6 due 1(a Why does a solution of chlorophyll appear green when illuminated with white

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