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Photosynthesis Chapter 10

Photosynthesis Chapter 10. Photosynthesis occurs in the chloroplast. Chloroplast = type of plastid. Proplastid Chloroplasts Chromoplasts Amyloplasts. When photosynthetic pigments absorb photons, four things can happen:. Photon re-emission (fluorescence) Heat generation

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Photosynthesis Chapter 10

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  1. Photosynthesis Chapter 10

  2. Photosynthesis occurs in the chloroplast. Chloroplast = type of plastid Proplastid Chloroplasts Chromoplasts Amyloplasts

  3. When photosynthetic pigments absorb photons, four things can happen: Photon re-emission (fluorescence) Heat generation Energy transfer (resonance transfer) Photochemistry

  4. Pigments absorb across specific wavelengths. Absorption Spectrum Multiple pigments allow more light to be harvested.

  5. Pigment molecules are organized into antenna complexes.

  6. Two types of antenna complexes with distinct reaction centers: RC absorbs at 700 nm (PS I) RC absorbs at 680 nm (PS II)

  7. PS I Involved with the reduction of NADPH for use in carbohydrate synthesisPS II Involved with ATP synthesis for use in carbohydrate production Two Distinct Photosystems

  8. Photosystems I and II

  9. Electrons come from the splitting of water.H2O ½O2 + 2H+ + 2e-2H2O O2 + 4H+ + 4e-

  10. Photosystems I and II

  11. Photosystems I and II

  12. Photophosphorylation SummaryPS II 4 photons ~2 ATP PS I 4 photons 2 NADPH

  13. Photosynthesis Overview

  14. Melvin Calvin

  15. Process of CO2 fixation = Calvin CycleThe Calvin cycle takes place in the chloroplast stroma.

  16. Calvin cycle has three main parts: Carboxylation Reduction Regeneration

  17. Glyceraldehyde-3-P

  18. Ribulose-1,5-bisphosphate carboxylase/oxygenase(Rubisco)1/8 - 1/4 total leaf protein

  19. Glyceraldehyde-3-P

  20. 3 Ribulose-1,5-bisphosphate + 3 CO23 Ribulose-1,5-bisphosphate + Glyceraldehyde-3-phosphate Summary Fixation of 1 CO2 molecule requires 3 ATP + 2 NADPH

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