1. PhotosynthesisPhotosynthesisPhotosynthesisPhotosynthesis

2. ETC builds proton gradient Chemiosmosis Light Rxns Summary

4. Light Rxns ETC Stroma Thylakoid Space II PS II drops e - through ETC

5. Light Rxns ETC Stroma Thylakoid Space II

6. Stroma Thylakoid Space II Light Rxns ETC Chlorophyll oxidizes H 2 O’s to replace lost e - Protons collect in thylakoid space O 2 is released

7. Stroma Thylakoid Space II Light Rxns ETC Chemiosmosis ATP Synthase

8. Light Rxns Stroma Thylakoid Space III Photosystem I re-energizes electrons NADP + picks up e - (and some protons, too) ETC

9. Light Rxns Summary H 2 O + Light  NADPH + O 2 + ATP E + H’s E

10. Light Reactions Review The primary products of the light rxns are…

11. Light Reactions Review A high proton concentration builds up in the…

12. Light Reactions Review Cluster of chlorophyll molecules

13. Light Reactions Review Using light to make ATP

14. Light Reactions Review The “taxi” that carries energy and hydrogen to the dark rxns

15. Light Reactions Review TWO contributors to the proton gradient.

16. Light Reactions Review Requirements for chemiosmosis