This article describes an organelle, a cell component with its own distinctive structure and function. In eukaryotic cells, this is bounded by its own membrane, which is a lipid bilayer made of phospholipid.
Unless otherwise specified, information about this organelle is about its in situ occurrence in vivo, i.e., its occurrence in its usual location in living cells.
|Type of organisms whose cells contain a nucleus||Eukaryotic cells only, including plant cells, animal cells, and the cells of protists and fungi.|
|Type of cells within the organisms that contain a nucleus||Most cells; in particular, any cells that have plans to divide further (i.e., undergo another cell cycle). An exception is mature red blood cells in mammals.|
|Number of nuclei within cell||1 in most cases; a few types of cells such as osteoclast have more than one nucleus.|
|Shape||The shape can vary from spherical to oblong or pear-shaped.|
|Size||5-10 of nuclear diameter for most cells; smaller cells have correspondingly smaller nuclei; for instance, yeast cells have a nuclear diameter of 1 .|
|Location within cell||Somewhere around the center of the cell, though it may not be perfectly in the middle. This location helps the nucleus perform its coordinating functions more uniformly with the cell.|
|Structural components||Nuclear envelope, nuclear lamina, chromosomes, nucleolus, and other nuclear bodies|