1. Photosynthesis

2. Setting the Scene…

4. Thylakoid Granum Stroma Stroma Thylakoid space

5. The Light Reactions PS I PS II e- e- e- e-

6. The Light Reactions PS I PS II e- e- e- e-

7. The Light Reactions PS I PS II e- e- e- e-

8. The Light Reactions PS I PS II e- e- e- e-

9. The Light Reactions PS I PS II e- e- e- e-

10. The Light Reactions PS I PS II e- e- e- e-

11. The Light Reactions PS I PS II e- e- e- e-

12. The Light Reactions PS I PS II e- e- e- e-

13. The Light Reactions PS I PS II e- e- e- e-

14. The Light Reactions PS I PS II e- e- e- e-

15. The Light Reactions PS I PS II e- e- e- e-

16. The Light Reactions PS I PS II e- e- e- e-

17. The Light Reactions PS I PS II e- e- e- e-

18. The Light Reactions PS I PS II e- e- e- e-

19. The Light Reactions PS I PS II e- e- e- e-

20. The Light Reactions PS I PS II e- e- e- e-

21. The Light Reactions PS I PS II e- e- e- e-

22. The Light Reactions PS I PS II e- e- e- e-

23. The Light Reactions PS I PS II e- e- e- e-

24. The Light Reactions PS I PS II e- e- e- e-

25. The Light Reactions PS I PS II e- e- e- e-

26. The Light Reactions H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

27. The Light Reactions H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ ADP + P PS I PS II e- e- e- e-

28. The Light Reactions H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ ATP PS I PS II e- e- e- e-

29. The Light Reactions H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ ATP PS I PS II e- e- e- e-

30. The Light Reactions H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ ATP PS I PS II e- e- e- e-

31. The Light Reactions ATP H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

32. The Light Reactions ATP H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

33. The Light Reactions ATP H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

34. The Light Reactions ATP H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

35. The Light Reactions ATP H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

36. The Light Reactions ATP H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

37. The Light Reactions Problem 1: Who is the final electron acceptor for the ETC in Photosystem I (PS I)? Problem 2: How can we replace the electrons lost by PS I? Problem 3: Who is the final electron acceptor for the ETC in PS II? Problem 4: How can we replace the electrons lost by PS II? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

38. The Light Reactions Problem 1: Who is the final electron acceptor for the ETC in Photosystem I? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

39. The Light Reactions Problem 1: Who is the final electron acceptor for the ETC in Photosystem I? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ NAD+ PS I PS II e- e- e- e-

40. The Light Reactions Problem 1: Who is the final electron acceptor for the ETC in Photosystem I? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ NAD+ PS I PS II e- e- e- e-

41. The Light Reactions Problem 1: Who is the final electron acceptor for the ETC in Photosystem I? Solution! High energy electron carrier!!! H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ NAD+ PS I PS II e- e- e- e-

42. The Light Reactions Problem 1: Who is the final electron acceptor for the ETC in Photosystem I? Solution! High energy electron carrier!!! H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ NAD+ PS I PS II e- e- e- e-

43. The Light Reactions Problem 1: Who is the final electron acceptor for the ETC in Photosystem I? Solution! High energy electron carrier!!! H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

44. The Light Reactions Problem 2: How can we replace the electrons lost by Photosystem I (PS I)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

45. The Light Reactions Problem 2: How can we replace the electrons lost by Photosystem I (PS I)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

46. The Light Reactions Problem 2: How can we replace the electrons lost by Photosystem I (PS I)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

47. The Light Reactions Problem 2: How can we replace the electrons lost by Photosystem I (PS I)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

48. The Light Reactions Problem 2: How can we replace the electrons lost by Photosystem I (PS I)? Solution! Take them from the ETC in PS II! H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ Problem 3: Who is the final electron acceptor for the ETC in PS II? PS I PS II e- e- e- e-

49. The Light Reactions Problem 3: Who is the final electron acceptor for the ETC in PS II? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

50. The Light Reactions Problem 3: Who is the final electron acceptor for the ETC in PS II? Solution! PS I! H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

51. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e-

52. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I H2O PS II e- e- e- e-

53. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I H2O PS II e- e- e- e-

54. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I H2O PS II e- e- e- e-

55. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ O2 H+ H+ e- e- PS I PS II e- e- e- e-

56. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ O2 H+ H+ e- e- PS I PS II e- e- e- e-

57. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ O2 H+ H+ e- e- PS I PS II e- e- e- e-

58. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ O2 H+ H+ e- e- PS I PS II e- e- e- e-

59. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? H+ H+ H+ H+ H+ H+ H+ H+ H+ O2 H+ H+ H+ H+ H+ e- e- H+ PS I PS II e- e- e- e-

60. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? H+ H+ H+ H+ H+ H+ H+ H+ H+ O2 H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e- e- e-

61. The Light Reactions Problem 4: How can we replace the electrons lost by Photosystem II (PS II)? Solution! Snag them from WATER! H+ H+ H+ H+ H+ H+ H+ H+ H+ O2 H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e- e- e-

62. The Light Reactions O2 ATP H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e- e- e-

63. The Light Reactions To the Calvin Cycle!!! O2 ATP H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ PS I PS II e- e- e- e- e- e-