noun, plural: nucleoids

The portion within a prokaryotic cell where the genetic material is to be found.


In contrast to eukaryotes with a nucleus, prokaryotes have a nucleoid where the genetic material can be found. The nucleoid is different from the nucleus of the eukaryotes in a way that the genetic material is not enclosed in a membrane to separate it from the cytoplasm.

Word origin: nucleo- + -oid; thus "like a nucleus".
Related forms: nucleoidal (adjective)

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