Nucleus of a Cell

The nucleus, present in eukaryotic cells, is a discrete structure containing chromosomes, which hold the genetic information for the cell. Separated from the cytoplasm of the cell by a double-layered membrane called the nuclear envelope, the nucleus contains a cellular material called nucleoplasm. Nuclear pores, present around the circumference of the nuclear membrane, allow the exchange of cellular materials between the nucleoplasm and the cytoplasm.

Don W. Fawcett/Science Source/Photo Researchers, Inc.

Appears in these articles:

Eukaryote; Cell (biology); Nucleus (biology); Cancer (medicine); Nucleolus

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