Photosynthesis2 3 15 10

Photosynthesis2 3 15 10 - 5 groups of photosynthetic...

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5 groups of photosynthetic bacteria From l to r: Chloroflexus (green non-sulfur bacteria, Chloroflexaceae), Rhodospirillum (purple bacteria, Rhodospirillaceae), Chlorobium (green sulfur bacteria, Chlorobiaceae), Heliobacterium (Gram-positive, Heliobacteriaceae), and Nostoc (Cyanobacteria, Nostocaceae).
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Major Groups of Photosynthetic Phototrophic Prokaryotes Type Bacterial Group Pigment(s) Primary Products e- donors Carbon Source Anoxygenic Halobacteria (Archaea) Bacterio- rhodopsin ATP None Organic Anoxygenic Filamentous Green Bchl a ATP Organic, S 2? ,S 2 O 3 2? Organic, CO 2 Anoxygenic Green Sulfur Bchl a ATP + NADH H 2 , S 2? , S 0 ,S 2 O 3 2? CO 2 Anoxygenic Purple Bchl a or b ATP H 2 , S 2? , S 0 ,S 2 O 3 2? ,organ ic CO 2 and/or organic Anoxygenic Heliobacteria Bchl g ATP + NADH Organic Organic Oxygenic Cyanobacteria Chl a ATP + NADPH H 2 O CO 2 www.chm.bris.ac.uk/motm/oec/motm.htm
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Chlorophylls and other pigment molecules funnel light energy to a reaction center Light-activated reaction center chlorophyll molecules are good electron donors (reducing agents)
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Reaction center chlorophylls Light-activated chlorophylls are good reducing agents (electron-donors like NADH) Oxidized chlorophylls are oxidizing agents (electron acceptors like O 2 )
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Anoxygenic photosynthesis: single reaction center Type II reaction centers: Light-activated chlorophyll reduces electron transport chain, receives electrons from electron transport chain (cyclic photophosphorylation) Requires organic carbon or other reducing compound as electron donor to make NADH Type I reaction centers: Light-activated chlorophyll reduces NAD+ to NADH, receives electrons from electron donor Light-activated chlorophyll reduces electron transport chain, receives electrons from electron transport chain (cyclic photophosphorylation)
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Oxygenic photosynthesis: cyanobacteria and chloroplasts have both type I and II reaction centers http://www.life.illinois.edu/govindjee/paper/gov.html
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The type II reaction center in cyanobacteria acquired an oxygen evolving complex
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Q: Oxygenic photosynthesis provides an important fitness advantage over anoxygenic photosynthesis because A) Only cyanobacteria can produce both ATP and reduced electron carriers B) Cyanobacteria can live in any aqueous environment, not dependent on reducing compounds like sulfur or hydrogen C) Only oxygenic photosynthesizers can reduce carbon dioxide to make organic carbon D) All of the above E) None of the above
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This note was uploaded on 09/02/2010 for the course BIO 1510 taught by Professor Unknown during the Spring '07 term at Georgia Tech.

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Photosynthesis2 3 15 10 - 5 groups of photosynthetic...

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