BB lecture 10-31-08 photosynthesis II

BB lecture 10-31-08 photosynthesis II - Chapter 10...

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Unformatted text preview: Chapter 10 (pp.198-204) Photosynthesis II: The Calvin cycle Learning objectives:. Know the three phases of the Calvin cycle . Describe the role of ATP and NADPH in the Calvin cycle. Describe what rubisco is and its role in photosynthesis Explain why photorespiration is detrimental to a plant. Describe how two types of plants have adapted to counter effects of photorespiration The Calvin cycle uses ATP and NADPH to convert CO 2 to sugar has three phases Carbon fixation Reduction Regeneration of the CO 2 acceptor occurs in the stroma should not be confused with the citric acid (Krebs) cycle The citric acid cycle is catabolic , and produces CO 2 , ATP and NADH/FADH 2 The Calvin cycle is anabolic , and produces CH 2 O, ADP and NADP + (G3P) Input (Entering one at a time) CO 2 3 Rubisco Short-lived intermediate 3 P P 3 P P Ribulose bisphosphate (RuBP) P 3-Phosphoglycerate P 6 P 6 1,3-Bisphoglycerate 6 NADPH 6 NADP+ 6 P P 6 Glyceraldehyde-3-phosphate (G3P) 6 ATP 3 ATP 3 ADP CALVIN CYCLE P 5 P 1 G3P (a sugar) Output Light H 2 O CO 2 LIGHT REACTION ATP NADPH NADP + ADP [CH 2 O] (sugar) CALVIN CYCLE Figure 10.18 O 2 6 ADP Glucose and other organic compounds Phase 1: Carbon fixation Phase 2: Reduction Phase 3: Regeneration of the CO 2 acceptor (RuBP) The enzyme that catalyzes the initial fixation of carbon is r ib u lose bis phosphate c arboxylase o xygenase What is the substrate? What does carboxylase imply? Rubisco is an abbreviation of the enzymes name/action. (G3P) Input (Entering one at a time) CO 2 3 Rubisco Short-lived intermediate 3 P P 3 P P Ribulose bisphosphate (RuBP)...
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BB lecture 10-31-08 photosynthesis II - Chapter 10...

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