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A [[cell]] that lacks a defined nucleus and [[organelle]]s.  Bacteria and blue-green algea are  composed of prokaryotic cells and are called [[prokaryotes]].<ref>http://biotech.icmb.utexas.edu/search/dict-search.html</ref> Prokaryotes are single-cell organisms, although some can form colonies.<ref>http://www.iscid.org/encyclopedia/Prokaryotic_Organisms</ref> The prokaryote DNA is structurally simple and frequently is composed of only one circular chromosome.<ref>Brown, T.A. "Genomes" Garland Science ; c2002.</ref>

A [[cell]] that lacks a defined nucleus and [[organelle]]s.  Bacteria and blue-green algea are  composed of prokaryotic cells and are called [[prokaryotes]].<ref>http://biotech.icmb.utexas.edu/search/dict-search.html</ref> Prokaryotes are single-cell organisms, although some can form colonies.<ref>http://www.iscid.org/encyclopedia/Prokaryotic_Organisms</ref> The prokaryote DNA is structurally simple and frequently is composed of only one circular chromosome.<ref>Brown, T.A. "Genomes" Garland Science ; c2002.</ref>