Organisms, namely bacteria and cyanobacteria, 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.
A prokaryote is a microscopic single-celled organism, including the bacteria and cyanobacteria, that has neither a distinct nucleus with a membrane nor other specialized organelles. Compare with eukaryote.
A term that describes cells whose internal construction and activities are relatively simple. Such cells lack organells, chromosomes, and other complex internal units that are common in the eucaryouts (see above).