| prokaryote | Organisms, namely bacteria and cyanobacteria (formerly known as blue green algae), characterised by the possession of a simple naked DNA chromosome, occasionally two such chromosomes, usually of circular structure, without a nuclear membrane and possessing a very small range of organelles, generally only a plasma membrane and ribosomes. (18 Nov 1997) |
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| prokaryote |
any member of the kingdom Monera. Prokaryotes are cellular organisms lacking a true nucleus and nuclear membrane. Their nuclear material consists of a single double-stranded DNA molecule, not associated with basic proteins. The microorganisms, comprising the bacteria and blue-green bacteria (formerly blue-green algae), are predominantly unicellular but may have filamentous, mycelial, or colonial forms. All (except the Mollicutes and Archaeobacteria) have a true cell wall containing peptidoglycan, and all reproduce by cell fission. See also Procaryotae. Cf. eukaryote.
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| prokaryote | a unicellular organism having cells lacking membrane-bound nuclei |
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