1. In biology:
* The nucleus is a membrane-bound organelle found in eukaryotic cells. It contains the cell's genetic material, organized as DNA in the form of chromosomes. The nucleus is responsible for controlling and regulating cellular activities, including growth, metabolism, and reproduction.
2. In physics:
* The nucleus is the central and dense part of an atom. It is composed of protons and neutrons, which are collectively called nucleons. The nucleus carries a positive charge due to the protons, and its mass accounts for almost the entire mass of the atom.
3. In other contexts:
* A nucleus can also refer to a central or essential part of something. For example, the nucleus of a city could refer to its downtown area.
To understand the definition of "nucleus" accurately, it's essential to consider the context in which the term is used.
