Unraveling Photosynthesis: Oxygen Source Mystery Solved

1. Chapter 10 Photosynthesis

2. Photosynthesis

3. Ps General Equation Requires:

4. Question • Does the Oxygen in sugar come from the CO2 or from the H2O ? • Model: CO2 + 2 H2O ----> CH2O + O2

5. Proof • Used 18O as a tracer. CO2 + 2 H2O ----> CH2O + O2 CO2 + 2 H2O ----> CH2O + O2

6. Ps: a redox process

7. Ps

8. Light

9. Too Hot Too Cold JustRight

11. Action Spectrum

14. Comment • In oceans, red light is lost or filtered out early because it has lower energy. • Only blue light which has higher energy can reach the lower depths.

15. Result • Many deep ocean fish are bright red in color. • Why? • They can’t be seen because there is no red light to reflect their color.

16. Photosynthesis Pigments

17. Chlorophylls

20. Accessory Pigments

21. Fall Leaf Colors

22. Chloroplast Structure

24. Photosystems

27. Cyclic Photophosphorylation

29. Noncyclic Photophsphorylation

30. Light Reaction

35. Light Reaction • Location – • Function

36. Light Reaction Requirements Products

37. Chemiosmosis Model

38. Chemiosmosis

41. Comment • There can be a 3 pH unit difference between the thylakoid space and the stroma.

43. Dark Reactions

44. Dark Reaction

45. Rubisco

49. C3 Ps Requirements Products