Cells with a relatively simple cell morphology that do not have a true membrane-delimited nucleus are called prokaryotes
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What is a prokaryote?</h3>
A prokaryote is a single-celled organism that lacks a nucleus, and other membrane-bound organelles.
But in the three-domain system, based upon molecular analysis, prokaryotes are divided into two domains: Bacteria (formerly Eubacteria) and Archaea (formerly Archaebacteria). Organisms with nuclei are placed in a third domain, Eukaryota. In the study of the origins of life, prokaryotes are thought to have arisen before eukaryotes
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