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AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
AP Biology - Photosynthesis (Part 1
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AP Biology - Photosynthesis (Part 1

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  • 1. Photosynthesis<br />“The Process That Feeds the Biosphere”<br />
  • 2. Terminology<br />Heterotrophs<br />Photoautotrophs<br />
  • 3. Important Structures<br />Chloroplast<br />Chlorophyll (pigment)<br />Stomata <br />Thylakoid<br />Grana<br />Stroma<br />
  • 4. Photosynthesis<br />CO2 + H2O + light  C6H12O6 + O2<br />
  • 5. Photosynthesis<br />Organisms split water as a source of electrons, then release O2<br />Electrons reduce CO2 to sugars (increase in ΔG requires energy)<br />
  • 6. Two Stages<br />Light Reactions<br />Light absorbed creates NADPH<br />Water split<br />ATP produced<br />Photophosphorylation<br />Thylakoids<br />Calvin Cycle<br />Carbon fixation<br />Uses NADPH and ATP<br />Stroma<br />
  • 7. Light<br />Visible wavelengths drive photosynthesis<br />Chlorophyll a and chlorophyll b absorb different wavelengths<br />Carotenoids= photoprotection<br />
  • 8. Photosystems<br />Pigments and proteins<br />Absorbed energy funneled to reaction center<br />Photosystems II and I absorb different wavelengths of light<br />
  • 9. Non-cyclic Electron Flow<br />PS II electron excited to PEA<br />Water split to replace lost electrons (O2 formed)<br />Electron passed down ETC to PS I, providing energy for ATP<br />Repeat process in PS I<br />NADP+ reduced by 2 e- to NADPH<br />
  • 10. Non-cyclic Electron Flow<br />
  • 11. Cyclic Electron FLow<br />No use of PS II<br />Rise in NADPH levels triggers cyclic flow that creates only ATP<br />
  • 12. Electron Transport / ATP Synthesis<br />DIFFERENCES:<br /><ul><li>Where electrons come from
  • 13. H+ reservoir area</li></ul>Similar proton-motive force in chloroplasts<br />

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