Nucleolus
- Pronunciation
- /NOO-kle-oh-luhs/
- Category
- Cell Biology
- Singular
- Nucleolus
- Plural
- Nucleoli
Definition
A nucleolus is a ribosome-rich, spherical body associated with a specific chromosomal segment, the nucleolus organizer. The nucleolus organizer contains the ribosomal RNA genes and the nucleolus is involved in the synthesis of ribosomal RNA. In the context of entomology, it is relevant mainly in the study of insect cellular biology.
Etymology
From Latin 'nucleolus', diminutive of 'nucleus', meaning 'kernel' or 'little nut'.
Example
The nucleoli are located in the nucleus of eukaryotic cells and are essential for ribosome synthesis.