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The Dark Side of Photosynthesis

The Dark Side of Photosynthesis. In stroma. In 3 stages. Dark Reaction/ Calvin Cycle of Photosynthesis. In stroma. In 3 stages. Dark Reaction/ Calvin Cycle uses ATP and NADPH (from light reaction) to convert CO 2 to sugar. Dark Reaction/ Calvin Cycle.

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The Dark Side of Photosynthesis

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  1. The Dark Side of Photosynthesis In stroma In 3 stages

  2. Dark Reaction/ Calvin Cycle of Photosynthesis In stroma In 3 stages

  3. Dark Reaction/ Calvin Cycle uses ATP and NADPH(from light reaction) to convert CO2to sugar

  4. Dark Reaction/ Calvin Cycle Phase 1: Carbon Fixation Phase 2: Reduction Phase 3:Regeneration of RuBP

  5. We are in the STROMA

  6. We are in the STROMA

  7. phase 1Carbon Fixation --> X3 CO2 attaches to a 5C sugar Ribulose Biphosphate (RuBP)via. Rubisco: P-C-C-C-C-C-C-P Rubisco (RuBP carboxylase) = enzyme

  8. phase 1 Carbon Fixation --> X3 2)very unstable molecule. .. immediately splits to form 2 molecules of 3 PGA (carbonphosphoglycerate) P-C-C-C C-C-C-P

  9. We are in the STROMA

  10. phase 2 Carbon - Reduction --> X3 addt’l phosphate group to each 3-phosphoglycerate from ATP (from light reaction) : P-C-C-C-P P-C-C-C-P forming 1, 3 biphosphoglycerate

  11. We are in the STROMA

  12. phase 2 C - Reduction --> (X3) 2)reduced(e- gained) by NADPH (from light reaction) to make G3P P-C-C-C P-C-C-C P-C-C-C P-C-C-C P-C-C-C P-C-C-C • (stores more potential energy) • (same sugar as in glycolysis)

  13. We are in the STROMA

  14. phase 2 Reduction --> (X3) 3)one G3P molecule exits (used later by the plant) P-C-C-C P-C-C-C P-C-C-C P-C-C-C P-C-C-C P-C-C-C

  15. We are in the STROMA

  16. phase 3Regeneration of CO2 acceptor RuBP --> 1) series of reactions rearranges the 5 G3P molecules into 3 RuBP … using up 3 more ATP’s.

  17. We are in the STROMA

  18. RuBP is then prepared to receive CO2 again

  19. For 1 G3P molecule the one that exited… (precursor to sugar) the cycle: • uses 9 ATP • uses 6 NADPH • uses 3 CO2

  20. We are in the STROMA (6)

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