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Photosynthesis Short Answer Practice

Photosynthesis Short Answer Practice. #1 What makes chlorophyll so unique?. Made of photon-absorbing porphyrin ring w ith Mg in center Nitrogen atoms around the Mg Photon of light r esonates the e- b etween the single a nd double bonds. #1 What makes chlorophyll so unique?.

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Photosynthesis Short Answer Practice

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  1. Photosynthesis Short Answer Practice

  2. #1 What makes chlorophyll so unique? • Made of photon-absorbing porphyrin ring with Mg in center Nitrogen atoms around the Mg • Photon of light resonates the e- between the single and double bonds

  3. #1 What makes chlorophyll so unique? • Hydrocarbon tail Attaches to Integral protein in the Thylakoid disk membrane

  4. #2 Compare PSII and PSI • Both absorb photons and excite e- • Both contain chlor a + other pigments • Reaction center of PSII absorbs 680 nm • Reaction center of PS I absorbs 700 nm • PSII receives e- from split water • PS I receives e- from Pc (end of ETC)

  5. #2 Compare PSII and PSI -PSII gives electrons to ETC -PSI give electrons to NADP+ PSII PSI FOUND IN THYLAKOID DISK MEMBRANE

  6. #3Compare chemiosmosis and ETC in mitochondrion and chloroplast: • Mitochondrion • e- come from food molecules • e- have high potential energy in bonds in organic compounds • e- passed to oxygen • Oxygen pick up H+ to form H2O • Chloroplast • e- come from splitting of H2O • Light energy excites e- to a higher energy level • e- flow from H2O to reaction center 680 in PSII to reaction center 700 in PSI • From PSI to NDR to reduce NADP+ to NADPH

  7. #4 CFC’s • Chlorofluorocarbons • Were put in aerosols, refrigerants, and styrofoam • Products containing CFC’s were Banned by those signing the Montreal Protocol 1987 • Recovery of ozone not expected until 2060’s.

  8. Ozone O3 • O3 (seen in teal blue in diagram) • Protective layer around the earth keeping harmful UV rays from reaching the earth • UV rays • (some enter, some blocked) • Infrared (trapped)

  9. #4 CFC’s • Cl breaks off an oxygen from ozone (O3) so it is no longer a protective layer around the earth.

  10. Global Warming • refers to the rising average temperature of Earth's atmosphere and oceans

  11. Greenhouse Gases CO2 (carbon dioxide) – most important! H2O (water vapor) CH4 (methane) CFC’s (chlorofluorocarbons) These can absorb heat and warm the atmosphere.

  12. Causes and Effects of Global Warming • Increase in greenhouse gases: especially CO2 (mostly from fossil fuel emissions) -Kills coral reefs -Melts polar icecaps -Raises ocean levels -Upsets weather

  13. CFC’s and Global Warming

  14. #4 Global Warming Solutions • Photosynthesis removes CO2 from the atmosphere • Reduce fossil fuel use (CO2 is an important global warming gas -absorbs heat) • Use alternate energy sources (wind, solar, geothermal, hydroelectric)

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