nucleolar organizer
Definition
- Noun:
- A specific chromosomal region: The nucleolar organizer is a specialized region on a chromosome that is responsible for forming the nucleolus following cell division. It contains the genes for ribosomal RNA (rRNA).
Usage
- The term is used in cell biology and genetics to describe the chromosomal site of rRNA gene clusters.
- It is a countable noun. Example: "The nucleolar organizers on these chromosomes are highly active."
Examples
- Noun:
- Scientists studied the nucleolar organizer to understand ribosome production.
- Mutations in the nucleolar organizer can disrupt the formation of the nucleolus.
Advanced Usage
- "Nucleolar organizer region (NOR)": This is a common extended term referring to the same concept, often used in more technical literature.
- The silver-staining technique is used to visualize the nucleolar organizer regions.
Variants and Related Words
- Organizer (noun): A general term for something that structures or forms a specific part. In genetics, it is often part of a compound term (e.g., nucleolar organizer).
- NOR (noun): A standard abbreviation for "nucleolar organizer region."
Synonyms
- NOR (Nucleolar Organizer Region): The abbreviated form is a direct synonym.
- rDNA locus: A more specific term referring to the cluster of ribosomal DNA genes that comprise the nucleolar organizer.
Related Terms (Not direct synonyms but contextually linked)
- Nucleolus (noun): The cellular structure assembled by the nucleolar organizer.
- Chromosome (noun): The structure on which the nucleolar organizer is located.
- Ribosomal RNA (rRNA) (noun): The type of RNA whose genes are located in the nucleolar organizer.
Noun
-
the particular part of a chromosome that is associated with a nucleolus after nuclear division
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