Learn about the structure and functions of the nucleus, a cell organelle that carries the genetic material of a cell. The nucleus consists of a nuclear envelope, nucleoplasm, nuclear matrix, chromatin, and nucleolus. The nucleus is a double membrane-bound organelle that contains the cell's genetic material in the form of DNA, which is organized into structures called chromosomes. Learn about the cell nucleus, the organelle that contains genetic material and controls the cell’s activities in eukaryotic cells. Explore its structure, functions, and evolution with diagrams and examples. The cell nucleus (from Latin nucleus or nuculeus 'kernel, seed'; pl.: nuclei) is a membrane-bound organelle found in eukaryotic cells. Eukaryotic cells usually have a single nucleus, but a few cell types, such as mammalian red blood cells, have no nuclei, and a few others including osteoclasts have many. The main structures making up the nucleus are the nuclear envelope, a double membrane that encloses the entire organelle and isolates its contents from the cellular cytoplasm; and the ...
