Chapter+21+Prokaryotes+and+Viruses[1]

Chapter+21+Prokaryotes+and+Viruses[1] - Prokaryotes and...

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Prokaryotes and Viruses  Chapter 21 0
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The Domains of Life EUBACTERIA (Bacteria) ARCHAEBACTERIA (Archaea) EUKARYOTES (Eukarya) Traditionally classified by numerical taxonomy Now increased use of comparative biochemistry, mainly sequences of  ribosomal RNA genes which evolve VERY slowly. 0
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Prokaryotic Characteristics No membrane-bound nucleus Single chromosome Cell wall (in most species) Prokaryotic fission Metabolic diversity 0
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Metabolic Diversity Photoautotrophs Photoheterotrophs Chemoautotrophs Chemoheterotrophs Where does it get its Energy? Light (Photo) Electrons from organic or inorganic molecules (Chemo) Where does it get its Carbon? CO2 (self feeders = autotrophs) Organic material (other feeders = heterotrophs) 
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The Prokaryotes 2 groups Archaebacteria Eubacteria Arose before the Eukaryotes Most of the history of life on earth includes only prokaryotes. Without prokaryotes, life would cease. Within you body there are more prokaryotic cells than your own cells 0
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Archaebacteria Methanogens Extreme halophiles Extreme thermophiles 0
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Methanogens  0 Archaebacteria Anaerobic Use CO 2  as e -  acceptor Produce Methane Live in Swamps, anaerobic wetlands, and guts of termites and ruminants
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Extreme Halophiles 0 Archaebacteria Love extreme salt Most are aerobic Live in Great Salt Lake, Dead Sea, seawater evaporation ponds Some are photoheterotrophic produce ATP by absorbing light with bacteriorhodopsin pigment
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Love extreme heat (80-110 o C) Anaerobic Require Sulphur as e -   donor/acceptor 0 Archaebacteria Extreme Thermopiles  Live in  Geothermal ocean vents, Sulphur springs, Volcanic surroundings   
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Eubacteria Most bacteria Most have cell wall made of peptidoglycan Reproduction by mainly by asexual Prokaryotic Fission Cells considered to be in same species but with minor  differences are identified as different strains Classification based largely on metabolism 0
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coccus bacillus spirillum Bacterial Shapes
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This note was uploaded on 04/25/2008 for the course V 011 taught by Professor Staff during the Spring '06 term at NYU.

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Chapter+21+Prokaryotes+and+Viruses[1] - Prokaryotes and...

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