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18 BISC 120_Chapter 27 POST 1

18 BISC 120_Chapter 27 POST 1 - Prokaryotes Chapter 27...

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10/4/2010 1 Chapter 27 Prokaryote structure & function Prokaryotes Bacteria & Archaea 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 & Archaea 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 Earth & profoundly influence environmental health Profoundly influence human health Teach us much about remarkable diversity of life Many careers in science, medicine & industry depend on an intimate knowledge of prokaryote structure & function +DUPIXO ³JHUPV´ ± 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: ± One gram of soil 10 9 ± Your gut 10 10 ± In lake tens to hundreds of trillions 10 12 ± In World Oceans one archaean species est @ 10 28
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