10-30-06 (17) Photosynthesis

10-30-06 (17) Photosynthesis - Photosynthesis...

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Photosynthesis October 30, 2006
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Photosynthesis The process that feeds the biosphere Conversion of light energy to chemical energy
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Energy Flow & Chemical Cycling Light energy ECOSYSTEM CO 2 + H 2 O Photosynthesis in chloroplasts Cellular respiration in mitochondria Organic molecules + O 2 ATP powers most cellular work Heat energ y Figure 9.2
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Photosynthesis: Outline Chloroplasts are present in all of the ‘green parts’ of plants Overview of photosynthesis as a whole Light reactions in detail Calvin cycle in detail Alternative mechanisms of carbon fixation
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Chloroplasts: The Sites of Photosynthesis Chloroplasts are present in all of the ‘green parts’ of plants Green color is from the chlorophyll found within the chloroplasts Chlorophyll
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Chloroplasts: The Sites of Photosynthesis
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Chloroplasts: The Sites of Photosynthesis Chloroplast Chloroplast DNA Ribosomes Stroma Inner and outer membranes Thylakoid 1 µm Granum
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The Sites of Photosynthesis (a) Aerobic prokaryote (b) Photosynthetic prokaryote 0.2 μ m 1 μ m Respiratory membrane Thylakoid membranes
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Tracking Atoms through Photosynthesis Summary of photosynthesis: 6 CO 2 + 12 H 2 O + E C 6 H 12 O 6 + 6 O 2 + 6 H 2 O 6 CO 2 + 6 H 2 O + E C 6 H 12 O 6 + 6 O 2 CO 2 + H 2 O + E [CH 2 O] + O 2
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Tracking Atoms through Photosynthesis Where does O 2 come from? CO 2 C + O 2 C + H 2 O [CH 2 O]
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Tracking Atoms through Photosynthesis Where does O 2 come from? C O 2 + 2 H 2 O [CH 2 O ] + H 2 O + O 2 CO 2 + 2 H 2 O [CH 2 O] + H 2 O + O 2
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Tracking Atoms through Photosynthesis
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Photosynthesis: A Preview Photosynthesis consists of two processes Light reactions
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