ESPM 131 213

ESPM 131 213 - ESPM 131 213 Bacteria and Archaea Structure...

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ESPM 131 213 Bacteria and Archaea Structure of a Cell Cytoplasmic membrane Cytoplasm - Water - Macromolecules ( proteins, nucleic acids…) - Ribosomes - Small organic molecules Cell Wall Prokaryotic Cells - Large double-stranded DNA molecule: bacterial chromosome = nucleoid - Circular DNA - Extrachromosomal DNA = Plasmids. Prokaryotic Cells : Bacteria & Archaea - Species of Archaea are more closely related to than are species of Bacteria - Evolutionary diversification from common ancestor went in two directions. Bacteria vs Archaea - Resemble under the microscope - But very different Abundance Soil : most diverse and heterogeneous habitat - Highest diversity of prokaryotes - Over 200 genera described; estimated to be over 1 million species with only about 3, 000 described DNA methods suggest about 4, 000 genomic species / g soil, with about 4 million of cell - Highest diversity of prokaryotes - High numbers Autochtonous : - constant levels of organisms despite fluctuations in local conditions - Many are oligotrphic
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This document was uploaded on 04/03/2008.

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ESPM 131 213 - ESPM 131 213 Bacteria and Archaea Structure...

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