organismid, kes koosnevad ühest või enamast rakust, milles on membraaniga ümbritsetud tuum ja organellid, A eukaryote is any organism whose cells have a cell nucleus and other organelles enclosed within membranes. Eukaryotes belong to the taxon Eukarya or Eukaryota. The defining feature that sets eukaryotic cells apart from prokaryotic cells (Bacteria and Archaea) is that they have membrane-bound organelles, especially the nucleus, which contains the genetic material and is enclosed by the nuclear envelope.