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The Prokaryotic Cell. Prokaryotes are unicellular organisms that lack organelles or other internal membrane-bound structures . Therefore, they do not have a nucleus, but, instead, generally have a single chromosome: a piece of circular, double-stranded DNA located in an area of the cell called the nucleoid. Most prokaryotes have a cell wall outside the plasma membrane.
DNA in pro-/eukaryotes. Cells are the basal unit of all living organisms (except virusses, but these are not true, independently living organisms). There are two kinds of cells on the earth: types of cells: prokaryotic cells and eukaryotic cells (eu = true; karyon = nucleus, pit).n eukaryotic cells, like in the maize cell shown here, DNA is located in the nucleus, the mitochondria and the chloroplasts (occuring only in plants and some protists).