1. Photosynthesis
Chapter 8

2. Organisms that use Photosyntheis
Anozygenic
Purple bacteria
Green sulfur bacteria
Green nonsulfur bacteria
Heliobacteria
Oxygenic
Cyanobacteria
Some algae
All land plants

3. Where does photosynthesis happen?

4. Parts of the Chloroplast
Thylakoid Membrane – where photosystems are found
Grana
Chlorophyll
Stroma

6. 3 Stages of Photosynthesis
1. Capturing energy from sunlight
2. Using the energy to make ATP and to reduce the compound NADP+ to NADPH
3. Using the ATP and NADPH to power the synthesis or organic molecules from CO2 in the air

7. Story Time- History of Photosynthesis
Helmont
Priestly
Jan Ingen-Housz
F.F. Blackman
C.B. van Niel

8. Pigments Photons- Short wavelength vs Long Wavelength
Can cause photoelectric effect

9. Chlorophyll Absorption Spectra
Chlorophyll b
Both can’t absorb nm…what color do you think this is?

10. Accessory Pigments
Caroteniods- ex Beta-carotene
Phycobiloproteins

11. Photosystem Organization
Antenna Complex
Reactions Ceneter

12. Antenna Complex
Captures photons from sunlight and channels them to the reactions center chlorophylls

13. Reaction Center Figure 8.10
In plants water serves as an electron donor, when water is oxidized oxygen is released along with two protons

14. Light-Dependant Reactions
Primary Photoevent
Charge Separation
Electron Transport
Chemiosmosis
ALL OCCUR IN THE THYLAKOID MEMBRANE!!!!!!!!!!!!

15. Photosystems
Chloroplasts have two photosystems…sulfur bacteria have 1 what does this suggest.
Photosystem nm
Photosystem nm
Cytochrome b6-f complex
Cyclic vs noncyclic

17. Video Break
Photosystems

18. And Now for a Video Break
Photosynthetic Electron Transport System and ATP Synthase

19. So What is made?
For every Electron Pair 1 molecule of ATP is made…but this is not enough to drive carbon fixation…how do they cope?
NADPH is also Made

20. Carbon Fixation Converts inorganic carbon into organic molecules
Calvin cycle
3 phases
Carbon Fixation
Reduction
Regeneration of RuBP

23. Calvin Cycle
Calvin Cycle

24. Photorespiration Releases CO2 Reduces the yield or photosynthesis
As Temperature rises C3 respiration becomes less favorable

25. Coping with High Temperatures
C4 pathway- Captures CO2 in one cell and the decarboxylation occurs in an adjacent cell.
Corn, sugarcane, grasses.
CAM pathway- stomata open during the night and close during the day
Cacti, pineapples, and some other plants