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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′karĀ·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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