prokaryote
Noun
Meaning
a unicellular organism having cells lacking membrane-bound nuclei; bacteria are the prime example but also included are blue-green algae and actinomycetes and mycoplasma
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Examples
It used to be widely assumed that the inner membrane is the original membrane of the once independent prokaryote, while the outer one is the food vacuole (phagosomal membrane) it was enclosed in initially.
Is it a simplified version of a parasitic prokaryote, or did it originate as a simpler virus that acquired genes from its host?
Mitochondria are thought to have come from a similar event, where an aerobic prokaryote was engulfed.