In terms of genomics, a nucleus is an organelle within a cell that is membrane-enclosed and houses the chromosomes.
The nuclear membrane has a variety of pores that enable the selective passage of specific molecules (such as proteins and nucleic acids) into and out of the nucleus.
The cell's nucleus, which houses the chromosomes, is enclosed by the nuclear membrane, which is composed of two layers.
The chromosomes are kept apart from the cytoplasm and other components of the cell by the nuclear membrane.
In this manner, genetic material is safeguarded, and processes involving gene expression can be controlled, particularly by proteins that live in the cytoplasm and perform certain functions in the nucleus at particular periods.
Pores that are selective in the proteins and other materials that can enter control access to the nucleus.