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Why do cells have a nucleus?

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The nucleus contains the DNA of the cell and this is vital for cell division and also for making the proteins that the cell needs to function.
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What is a nucleus of an cell?

the nucleaus is a membrane-enclosed organelle found in eukaryotic cells. It contains most of the cell's genetic material, organized as multiple long linear DNA molecules in co

What if a cell had no nucleus?

There would not be a cell without a nucleus it is like saying what if a human without a brain. It is impossible.