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Photosynthesis Big Idea #2: Energy is needed to do stuff. Essential Knowledge • 2A2: Organisms capture and store free energy for use in biological processes. Producers: Phototrophs • Use free energy solar radiation to produce sugar (PS) • Plants, Algae (Phytoplankton), Bacteria PS Occurs in Chloroplasts Found in all green parts Most abundant in mesophyll cells Chlorophyll: green pigment that captures free energy sunlight. Chloroplast Structure •Thylakoids are membrane-bound discs •Outside fluid is called the stroma •Contained in a double membrane Chloroplast x5,755 Producers: Chemotrophs • Capture free energy from small inorganic molecules (H2S) to produce sugars (chemosynthesis) • Can occur w/out O2. • Bacteria Evolution of PS • Started in prokaryotic cells (bacteria) and created an oxygenated atmosphere. • rRNA analysis • Made foundation for eukaryotic PS. Mr. Anderson PS Video Clip Chloroplast Diagram PS Cloze Activity! Review of Calvin Cycle http://www.science.smith.edu/departments/ Biology/Bio231/calvin.html http://www.youtube.com/watch?v=OYSD1jO D1dQ