1. AP Biology Light Dependent Reactions – Electron Transport Chain

2. Valence Electrons

3. Energy and Atoms Third energy level (shell) Second energy level (shell) First energy level (shell) Atomic nucleus Energy absorbed Energy lost

4. Photosynthesis Light Reaction

5. Non-cyclic electron flow

6. Non-cyclic Electron Flow *** Electrons start in photosystem II, and move through Photosystem I, as they work their way to NADPH. Along the way, they help to pump H+ to allow for the creation of ATP. The electrons do not return to where they came from.*** Photosystems – protein complexes that contain chlorophyll (and other pigments). These structures funnel light energy to the Mg atom for the ETC. Accessory proteins – these help to move excited electrons down the ETC in a series of REDOX reactions.

7. Redox reaction

8. Where it is occurring?

9. Water and Photosystems 1 and 2

10. Cyclic electron flow

11. Cyclic Electron Flow *** Electrons start in photosystem I and move through several accessory proteins. The main function of these electrons is to pump H+ so that ATP can be made. These electrons DO return to where they came from.*** Photosystems – protein complexes that contain chlorophyll (and other pigments). These structures funnel light energy to the Mg atom for the ETC. Accessory proteins – these help to move excited electrons down the ETC in a series of REDOX reactions.

12. Where it is occurring?

13. More surface srea = More energy

14. (How many electrons are in Mg’s outer shell?) Chlorophyll A or B molecule.

15. Answer: 2 Those 2 electrons will leave Mg and enter into the Electron Transport Chain.

16. Photosystem and collecting sunlight energy.

17. Non-cyclic electron flow

18. H+ (protons) being pumped into the thylakoid to “build” potential energy.

19. Non-cyclic electron flow

20. Cyclic electron flow

21. Cytochrome C ALL organisms have this important proton pumping protein

22. Potential Energy

23. Turning Potential energy into Kinetic energy to make ATP

24. Chemiosmosis and Energy Coupling.

25. Photosynthesis Light Reaction converts Sunlight into chemical energy

26. Calvin Cycle uses chemical energy to build sugar