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Photosynthesis

Photosynthesis. in-text, p. 113. 12H 2 O + 6CO 2. 6O 2 + C 6 H 12 O 6 + 6H 2 O. WATER. CARBON DIOXIDE. OXYGEN. GLUCOSE. WATER. Tasks. Capture energy from sunlight Store energy in ATP and NADPH Use energy to fix carbon and make sugar. Fig. 7.7, p. 118. Capture energy from light.

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Photosynthesis

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  1. Photosynthesis

  2. in-text, p. 113 12H2O + 6CO2 6O2 + C6H12O6 + 6H2O WATER CARBON DIOXIDE OXYGEN GLUCOSE WATER

  3. Tasks • Capture energy from sunlight • Store energy in ATP and NADPH • Use energy to fix carbon and make sugar

  4. Fig. 7.7, p. 118 Capture energy from light these molecules can absorb photons and re-emit the energy CHLOROPHYLL a BETA-CAROTENE

  5. electron acceptor Fig. 7.11, p. 120 e– electron transport system e– e– ATP e– Electron flow through transport system sets up conditions for ATP formation at other membrane sites.

  6. Fig. 7.3a, p. 114 upper surface of leaf photosynthetic cells two outer membrane layers part of thylakoid membrane system(the chloroplast’s innermost membrane) stroma

  7. Fig. 7.9, p. 119 water-splitting complex thylakoid compartment H2O 2H + 1/2O2 P680 P700 pool of electron transporters acceptor acceptor PHOTOSYSTEM II (light green) PHOTOSYSTEM I (light green) stroma

  8. Fig. 7.12a, p. 121 Store energy in ATP and NADPHthe light-dependent reactions sunlight THYLAKOID COMPARTMENT H2O second electron transport system photolysis e– e– ATP SYNTHASE NADPH NADP+ first electron transport system ATP ADP + Pi PHOTOSYSTEM II PHOTOSYSTEM I STROMA

  9. in-text, p. 113 12H2O + 6CO2 6O2 + C2H12O6 + 6H2O WATER CARBON DIOXIDE OXYGEN GLUCOSE WATER consequence of splitting water source of electrons

  10. Use energy to fix carbon and make sugar ATP ADP + Pi LIGHT-DEPENDENT REACTION LIGHT-INDEPENDENT REACTION NADPH NAD+ P glucose

  11. 6 CO2 (from the air) Fig. 7.15, p. 123 CARBON FIXATION 6 6 RuBP unstable intermediate 12 PGA 6 ADP 12 ATP CALVIN-BENSON CYCLE 6 ATP 12 NADPH 12 ADP 12 Pi 12NADP+ 10 12 PGAL 2 PGAL Pi P glucose

  12. in-text, p. 113 source of carbon for sugar by product 12H2O + 6CO2 6O2 + C2H12O6 + 6H2O WATER CARBON DIOXIDE OXYGEN GLUCOSE WATER consequence of splitting water source of electrons

  13. Fig. 7.18, p. 127 light-independent reactions in stroma of chloroplast light-dependent reactions at thylakoids of chloroplast CO2 into leaf O2 out light LIGHT-DEPENDENT REACTIONS 6O2 12H2O ATP NADP+ NADPH ADP + Pi PGA CALVIN-BENSON CYCLE PGAL 6H2O 6CO2 RuBP P C6H12O6 (phosphorylated glucose) end product (e.g. sucrose, starch, cellulose)

  14. Can photosynthesis mitigate the effects of global warming? • Almost half of the photosynthesis on Earth is carried out by phytoplankton in the sea

  15. Carbon dioxide was blamed for the deaths of around 1700 people in Cameroon, west Africa, in 1986 when a massive release of gas occurred from Lake Nyos, a volcanic crater lake.

  16. SOIREE – Southern Ocean Iron Enrichment Experiment

  17. Can photosynthesis mitigate the effects of global warming?

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