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What does the nucleus of a cell do?

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The nucleus of the cell contains much of the DNA of the cell, and it regulates the activities of that cell, whatever those activities are. The nucleus is composed of chemical structures that orchestrate chemical reactions that make the cell function. It is the nucleus, or, rather, those things in it, that control what the cell does, including those activities that keep the cell alive, as well as the things it does to contribute to the functioning of the organism whose structure it is a part of.
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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.