section5 - MIT Department of Biology 7.014 Introductory...

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MIT Department of Biology Recitation Section 5 7.014 Introductory Biology, Spring 2005 February 16-17, 2005 Biochemistry—Photosynthesis and Respiration A. Photosynthesis background 1. Why do we consider O 2 a booster of evolution? 2. Why was it advantageous for a cell to develop photosynthesis? 3. Photosynethesis has two phases—light and dark. What does each phase accomplish? B. Photosynthesis—light reactions 1. Below are the schematics for cyclic and noncyclic photophosphorylation. Identify each schematic and discuss the order of steps in each process. PS1 PS2 Electron acceptor Electron acceptor A2 Acceptor 3 Stroma Thylakoid membrane ATP synthase H + H + H + H + H + H + H + H + H + H + H + H + ADP+ Pi ATP
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NADPH NADP + PS1 PS2 Electron acceptor Electron acceptor A2 Acceptor 3 Stroma ATP synthase H + H + 2H + H + H + H + H + H + H + H + H + H + ADP+ Pi ATP A2’ H 2 O 2e 1⁄2 (O 2 ) Thylakoid membrane
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2. What are the main differences between the two processes? 3. What is the ATP made in photosynthesis used for?
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