10-6 Prokaryote structure and Function

10-6 Prokaryote structure and Function - 10/4/2010...

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10/4/2010 1 Chapter 27 Prokaryotes Bacteria The first organisms to inhabit the Earth Live in all of Earth’s habitats and essentially define the Biosphere Fig. 27-UN2 Eukarya Archaea Bacteria Prokaryotes Bacteria The first organisms to inhabit the Earth Live in all of Earth’s habitats and essentially 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 Harmful “germs” & helpful “microflora” to humans - 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
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This note was uploaded on 02/06/2011 for the course BIO 120 at USC.

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10-6 Prokaryote structure and Function - 10/4/2010...

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