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prokaryote |
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prokaryote: see Monera Monera, taxonomic kingdom that comprises the prokaryotes ( bacteria and cyanobacteria ). Prokaryotes are single-celled organisms that lack a membrane-bound nucleus and usually lack membrane-bound organelles (mitochondria, chloroplasts; see cell , in biology). ..... Click the link for more information. . prokaryoteAny cellular organism that lacks a distinct nucleus. Organisms classified in the domains Bacteria (including blue-green algae, or cyanobacteria) and Archaea are prokaryotes; all other organisms are eukaryotes and are placed in the domain Eukarya. Prokaryotic cells lack a nuclear membrane and most of the components of eukaryotic cells. The cytoplasm includes ribosomes that carry out protein synthesis and a double-stranded DNA chromosome, usually circular. Many prokaryotes also contain additional circular DNA molecules called plasmids. The flagella are distinct from those of eukaryotes in design and movement. prokaryote [prō′kar·ē‚ōt] (cell and molecular biology) A primitive nucleus, where the deoxyribonucleic acid-containing region lacks a limiting membrane. Any cell containing such a nucleus, such as the bacteria and the blue-green algae. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Authors should be aware that previous taxonomic spelling of binomial names exist and check their historic evolution in the List of Prokaryotic Names with Standing in Nomenclature (www. Community structure and function in prokaryotic marine plankton. According to them, the genes tRNA synthetase, ATPase, and carbomyl phosphate synthetase could not be used confidently to root the tree of life because of the difficulty to choose between different evolutionary scenarios, knowing that gene duplication, gene loss, and lateral gene transfer have been frequent during prokaryotic evolution. |
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