The nucleus is a membrane-enclosed organelle. The nucleus can be found in the eurkaryotic cells and contains most of the cell's genetic material. The nucleus is also the control center of the cell.

There is a double membrane that surrounds the nucleus. The nuclear membrane has pores that allows movement of substances through it, and it joins up with the endoplasmic reticulum. There are chromosomes in the nucleus that are made of DNA and associated proteins called histones. There may be one dark stained body called a nucleolus in the nucleus. And it contains genes that hold information that is needed to make proteins.

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