nucleolus organizer
Definition
Noun: * Nucleolus organizer: A specific, specialized region on a chromosome that is responsible for the formation of the nucleolus following cell division (nuclear division). It contains the genes for ribosomal RNA (rRNA).
Usage
The term is used in cell biology and genetics to describe a functional region of a chromosome. * The nucleolus organizer regions are crucial for ribosome assembly. * Scientists studied the activity of the nucleolus organizer during the cell cycle.
Advanced Usage
- Nucleolar Organizing Region (NOR): This is a synonymous term frequently used in scientific literature. It refers to the same chromosomal region.
- The silver-staining technique is used to visualize the Nucleolar Organizing Regions.
Variants and Related Words
- Nucleolar organizer (noun): An alternative spelling and form with identical meaning.
- NOR (noun): A common abbreviation for "nucleolar organizing region."
Synonyms
- Nucleolar organizing region (NOR): The direct and most common synonym.
- Secondary constriction: A cytological term referring to the appearance of this chromosome region under a microscope, though this term is less specific to its function.
Noun
-
the particular part of a chromosome that is associated with a nucleolus after nuclear division
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