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Not all are. Many biologists believe that bacteria are alive, and they do not have a nucleus. Also, though there is some debate, viruses are also sometimes considered alive, and not only do they not have a nucleus, they do not even have a plasma membrane. The definition of what is alive and what is not is quite complex and goes beyond nucleated cells called eucaryotes and non-nucleated cells called procaryotes.

The red blood cells in your body are not nucleated.

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18y ago

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