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Photosynthesis<br />“The Process That Feeds the Biosphere”<br />
Terminology<br />Heterotrophs<br />Photoautotrophs<br />
Important Structures<br />Chloroplast<br />Chlorophyll (pigment)<br />Stomata <br />Thylakoid<br />Grana<br />Stroma<br />
Photosynthesis<br />CO2  +  H2O  +  light    C6H12O6  +  O2<br />
Photosynthesis<br />Organisms split water as a source of electrons, then release O2<br />Electrons reduce CO2 to sugars (i...
Two Stages<br />Light Reactions<br />Light absorbed creates NADPH<br />Water split<br />ATP produced<br />Photophosphoryla...
Light<br />Visible wavelengths drive photosynthesis<br />Chlorophyll a and chlorophyll b absorb different wavelengths<br /...
Photosystems<br />Pigments and proteins<br />Absorbed energy funneled to reaction center<br />Photosystems II and I absorb...
Non-cyclic Electron Flow<br />PS II electron excited to PEA<br />Water split to replace lost electrons (O2 formed)<br />El...
Non-cyclic Electron Flow<br />
Cyclic Electron FLow<br />No use of PS II<br />Rise in NADPH levels triggers cyclic flow that creates only ATP<br />
Electron Transport / ATP Synthesis<br />DIFFERENCES:<br /><ul><li>Where electrons come from
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AP Biology - Photosynthesis (Part 1

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AP Biology - Photosynthesis (Part 1

  1. 1. Photosynthesis<br />“The Process That Feeds the Biosphere”<br />
  2. 2. Terminology<br />Heterotrophs<br />Photoautotrophs<br />
  3. 3. Important Structures<br />Chloroplast<br />Chlorophyll (pigment)<br />Stomata <br />Thylakoid<br />Grana<br />Stroma<br />
  4. 4. Photosynthesis<br />CO2 + H2O + light  C6H12O6 + O2<br />
  5. 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. 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. 7. Light<br />Visible wavelengths drive photosynthesis<br />Chlorophyll a and chlorophyll b absorb different wavelengths<br />Carotenoids= photoprotection<br />
  8. 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. 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. 10. Non-cyclic Electron Flow<br />
  11. 11. Cyclic Electron FLow<br />No use of PS II<br />Rise in NADPH levels triggers cyclic flow that creates only ATP<br />
  12. 12. Electron Transport / ATP Synthesis<br />DIFFERENCES:<br /><ul><li>Where electrons come from
  13. 13. H+ reservoir area</li></ul>Similar proton-motive force in chloroplasts<br />

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