Presentation on theme: "Photosynthesis Chapter 8. Organisms that use Photosyntheis Anozygenic –Purple bacteria –Green sulfur bacteria –Green nonsulfur bacteria –Heliobacteria."— Presentation transcript:
Photosynthesis Chapter 8
Organisms that use Photosyntheis Anozygenic –Purple bacteria –Green sulfur bacteria –Green nonsulfur bacteria –Heliobacteria Oxygenic –Cyanobacteria –Some algae –All land plants
Where does photosynthesis happen?
Parts of the Chloroplast Thylakoid Membrane – where photosystems are found Grana Chlorophyll Stroma
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 CO 2 in the air
Story Time- History of Photosynthesis Helmont Priestly Jan Ingen-Housz F.F. Blackman C.B. van Niel
Pigments Photons- Short wavelength vs Long Wavelength –Can cause photoelectric effect
Chlorophyll Absorption Spectra Chlorophyll a Chlorophyll b Both cant absorb nm…what color do you think this is?
Accessory Pigments Caroteniods- ex Beta-carotene Phycobiloproteins
Antenna Complex Captures photons from sunlight and channels them to the reactions center chlorophylls
Reaction Center Figure 8.10 In plants water serves as an electron donor, when water is oxidized oxygen is released along with two protons
Light-Dependant Reactions Primary Photoevent Charge Separation Electron Transport Chemiosmosis –ALL OCCUR IN THE THYLAKOID MEMBRANE!!!!!!!!!!!!
Photosystems Chloroplasts have two photosystems…sulfur bacteria have 1 what does this suggest. Photosystem nm Photosystem nm Cytochrome b6-f complex –Cyclic vs noncyclic
Video Break Photosystems
And Now for a Video Break Photosynthetic Electron Transport System and ATP SynthasePhotosynthetic Electron Transport System and ATP Synthase
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
Carbon Fixation Converts inorganic carbon into organic molecules Calvin cycle –3 phases Carbon Fixation Reduction Regeneration of RuBP
Photorespiration Releases CO 2 Reduces the yield or photosynthesis As Temperature rises C3 respiration becomes less favorable
Coping with High Temperatures C 4 pathway- Captures CO 2 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