18 BISC 120_Chapter 27 POST 1

18 BISC 120_Chapter 27 POST 1 - 10/4/2010 Prokaryotes...

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10/4/2010 1 Chapter 27 Prokaryotes Bacteria The first organisms to inhabit the Earth /LYH LQ DOO RI (DUWK¶V KDELWDWV DQG HVVHQWLDOO\ define the Biosphere Fig. 27-UN2 Eukarya Archaea Bacteria Prokaryotes Bacteria The first organisms to inhabit the Earth /LYH LQ DOO RI (DUWK¶V KDELWDWV DQG HVVHQWLDOO\ define the Biosphere
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10/4/2010 2 Archaea Many are Extremophiles love r of extremes Halophiles Thermophiles Barophiles Others live in moderate environs but are nutritionally interesting: methanogens use CO 2 to oxidize H 2 and release CH 3 A Yellowstone Geothermal hot spring Why study prokaryotes? ± Are major agents of transformations on planet Earth ± Profoundly influence human health ± Teach us much about remarkable diversity of life ± Many careers in science, medicine & industry depend on knowledge of prokaryotes Why study prokaryotes? ± Major agents of change (transformations) on planet ± Profoundly influence human health ± Teach us much about remarkable diversity of life ± Many careers in science, medicine & industry depend on +DUPIXO ³JHUPV´ ² KHOSIXO ³PLFURIORUD´ WR KXPDQV - anthropocentric biases!
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10/4/2010 3 Small size, astronomical numbers Individual cells are not readily observed but their influence can be profoundly felt and collectively they can be seen at large scales. ± Cell size (small) 0.5um to 5um (10 -6 meter) ± Implications for large surface to volume ratio ± High abundance: ² One gram of soil 10 9 ² Your gut 10 10 ² In lake tens to hundreds of trillions 10 12 ² In World Oceans one archaean species est @ 10
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This note was uploaded on 10/05/2010 for the course BISC 120 taught by Professor Webb,wetzer,? during the Fall '07 term at USC.

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18 BISC 120_Chapter 27 POST 1 - 10/4/2010 Prokaryotes...

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