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Cells that do not contain a "true" nucleus are called prokaryotes. Sometimes eukaryotic cells are anucleate(no nucleus) when mature. Erythrocytes (red blood cells) in mammals are an example of eukaryotic cells that do not contain a nucleus when mature.

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Which organisms have cells without nuclei?

Organisms that have cells without nuclei are called prokaryotes. This includes bacteria and archaea. Prokaryotic cells do not have a defined nucleus but instead have a nucleoid region where the genetic material is located.


Multicelluar organisms whose cells have nuclei but do not have cell walls?

Multicellular organisms whose cells have nuclei but don't have cell walls are called anamalia cells


What are organisms made of cells that contain nuclei?

Organisms made of cells that contain nuclei are classified as eukaryotes. Eukaryotic cells have a well-defined nucleus that houses their genetic material within a membrane-bound organelle. Examples of eukaryotic organisms include animals, plants, fungi, and protists.


Bioncave cells in blood that lack nuclei when they mature are called what?

Some unicellular organisms get by fine with no nucleus. The general term for these is prokaryotes. (A few prokaryotes form multicelluar stages, but this is not common.) Most multicellular organisms... and some unicellular organisms... do have cell nuclei. The general term for these is eukaryotes. Some specialized cells in multicellular organisms have no nucleus. For example, mammalian red blood cells have no nucleus. The generic term for any cell without a nucleus, whether a prokaryote or a specialized cell in a eukaryote, is anucleate (which simply means "without a nucleus").


Are there living organisms without cells?

No, all living organisms are made up of cells. Cells are the basic unit of structure and function in living organisms.