CLASSIFICATION OF PROKARYOCYTES Bergey’s Manual of Systematic Bacterilogy, 2 nd edition, is the standard for classification of prokarocytes. Two domains, Bacteria and Archaea, are included. Each domain is divided into phyla, based on similarities in rRNA. Organisms continue to be divided into taxa that are more and more specific until, eventually reaching the species level. In eukaryocytes, a species is defined as a group of closely related organisms that breed among themselves. A bacterial species is defined as a population of cells with similar characteristics. (Bacteria mostly reproduce by asexual binary fission, so the other definition can’t fit.) Members of the species are VERY similar to each other, but all may not be totally identical. The designation of strain is used for these slightly different versions of the same species of bacteria. Strains are identified by
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