U13_F08 - Unit 13 1 UNIT 13 PART A: THE LIGHT-DEPENDENT...

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Unit 13 1 U NIT 13 P ART A: T HE L IGHT -D EPENDENT REACTIONS OF P HOTOSYNTHESIS P ART B: T HE C ARBON -A SSIMILATION R EACTIONS OF P HOTOSYNTHESIS P ART C: G LYCOGEN S YNTHESIS AND D EGRADATION P ART A: T HE L IGHT - D EPENDENT R EACTIONS O F P HOTOSYNTHESIS Photosynthetic organisms trap solar energy and form ATP and NADPH which they use as energy sources to make carbohydrates and other organic compounds from CO 2 and H 2 O. Assignment: Nelson & Cox pp. 742 – 749, 752 - 764. 1. Distinguish between the light-dependent and the carbon-assimilation reactions of photosynthesis (p. 742). 2. Draw a simple diagram of a chloroplast. (See Figs. 19-45, p. 743, and 19-63, p. 759). Label the following: inner membrane, outer membrane, thylakoid membrane, grana, stroma, and lumen.
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Unit 13 2 3. Light absorption a. Name and describe the molecules that absorb light (pp. 745 - 746). b. Use Fig. 19-48 (p. 746) to explain how chloroplasts maximize the efficiency of absorption of visible light. 4. Photosystems a. What is a photosystem (p. 747)? b. What is a reaction center (p. 747)? c. What is the mechanism by which light drives electron transfer (pp. 748 - 749)? 5. Photoelectron transfer chain: The electron transfer chain of chloroplasts is shown in Fig. 19-56 (p. 752). a. Why is the diagram called the Z scheme (p. 753)? b. On the diagram, note any electron flow that requires an input of energy as well as any that occurs passively. c. On the Z scheme diagram note the following: photosystem 1, photosystem 2, NADP + /NADPH, cytochrome b 6 f complex, plastocyanin, plastoquinone, oxygen evolving complex. d. Compare the cytochrome b 6 f complex to the cytochrome bc 1 complex in the mitochondrion (p. 756). e. What molecules in the photosynthetic electron transport chain are equivalent to ubiquinone and cytochrome c in the mitochondrial chain (p. 756)? f. Name the process that occurs in the cytochrome b 6 f complex and explain why it is important (p. 756).
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Unit 13 3 e. On your Z scheme diagram include cyclic electron flow. Why is cyclic electron flow sometimes advantageous to the plant (p. 756)? f.
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This note was uploaded on 04/07/2009 for the course BIOBM 330 taught by Professor Blankenship during the Spring '09 term at Cornell University (Engineering School).

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U13_F08 - Unit 13 1 UNIT 13 PART A: THE LIGHT-DEPENDENT...

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