1. Resembling a nucleus.>BR? 2. The aggregated DNA of a bacterium, seen as a distinct region inside the cell. 3. The nuclear region of a bacterium, consisting of a dense, centrally located, irregularly shaped region containing DNA material without a surrounding nuclear membrane.
4. The genetic material (nucleic acid) of a virus, situated in the center of the virion (complete virus particle with its DNA or RNA core and protein coat as it exists outside the cell).