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Photosynthesis

Photosynthesis. AP Biology Bloomington High School. The Equation. 6CO 2 + 6H 2 O + light  C 6 H 12 O 6 + 6O 2 Chlorophyll required Water both consumed & produced. Chloroplasts. Site of photosynthesis Structure Double membrane Thylakoids Granum (Stack of thylakoids)

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Photosynthesis

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  1. Photosynthesis AP Biology Bloomington High School

  2. The Equation 6CO2 + 6H2O + light  C6H12O6 + 6O2 Chlorophyll required Water both consumed & produced

  3. Chloroplasts • Site of photosynthesis • Structure • Double membrane • Thylakoids • Granum (Stack of thylakoids) • Stroma

  4. Chloroplasts • Relating structure to function • Thylakoid space • Allows for accumulation of H+ • Segregates H+ from rest of organelle

  5. Chloroplasts • Relating structure to function • Thylakoid membrane • Contains photosystems & ETC

  6. Chloroplasts • Relating structure to function • Large number of thylakoids • Large surface area • Large number of ETC and photosystems

  7. Chloroplasts • Relating structure to function • Inner membrane • Segregates chemical of Calvin-Benson cycle from cytosol

  8. Photosynthesis

  9. Light Reactions

  10. Light Reactions • Photosystem II captures light energy P680

  11. Light Reactions • Light energy passed to reaction center P680

  12. Light Reactions • 2 e- boosted to higher energy state P680

  13. ATP Light Reactions • 2 e- passed through ETC to Photosystem I • H+ gradient created; ATP produced P700 P680

  14. ATP Light Reactions • Photosystem I captures light energy • Passes it to reaction center P700 P680

  15. ATP Light Reactions • e- from P700 boosted to higher energy state P700 P680

  16. ATP Light Reactions • e- move through ETC • e- accepted by NADP+ NADP+ P700 P680

  17. ATP Light Reactions • 2e- + 1H+ + NADP+  NADPH NADP+ NADPH P700 P680

  18. ATP Light Reactions • Water split • e- from water replace lost e- from P680 • O2 leaves NADPH H2O O2 P700 H+ P680

  19. Calvin Cycle

  20. Calvin Cycle • Rubisco fixes 6CO2 to 6RuBP (5-C) RuBP = ribulose biphosphate • 3PG (3-C) produced 3PG = 3-phosphoglycerate

  21. Calvin Cycle • 3PG converted to 12 G3P • G3P = glyceraldehyde 3-phosphate • 12 ATP used • 12 NADPH used

  22. Calvin Cycle • 2 G3P exit cycle & used to make glucose • Glucose used to make sugars & other carbohydrates

  23. Calvin Cycle • 10 G3P (3-C) used to make 6 RuBP (5-C) • 6 ATP used

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