nucleolar organiser

Thân thiện

The student observes the nucleolar organiser region under the microscope.

Definition

Noun 1. A specific chromosomal region: The nucleolar organiser is a distinct part of a chromosome that is responsible for the formation of the nucleolus following the division of a cell's nucleus. It contains the genes for ribosomal RNA.

Usage Examples

• Noun:
  • The nucleolar organiser is essential for ribosome production.
  • Scientists studied the specific DNA sequences within the nucleolar organiser region.
  • Mutations in the nucleolar organiser can affect cell growth and protein synthesis.

Advanced Usage

• "Nucleolar organiser region (NOR)": This is the full technical term for the specific chromosomal segment. It is often abbreviated as NOR in scientific literature.
  • The silver-staining technique is used to visualize the nucleolar organiser regions on metaphase chromosomes.

Variants and Related Words

• Nucleolar organizer: An alternative spelling, primarily used in American English.
• NOR: A common abbreviation for "nucleolar organiser region."
• Ribosomal DNA (rDNA): The type of DNA sequence found within the nucleolar organiser, which codes for ribosomal RNA.

Synonyms

• NOR (as an abbreviation).
• Nucleolus organizer region.

Notes on Meaning

This is a specialized term used in cell biology and genetics. It refers to a functional region of a chromosome, not a physical object one can hold. Its primary role is in the synthesis of ribosomal components, making it fundamental to cellular function.

Học thuật

Noun

1. the particular part of a chromosome that is associated with a nucleolus after nuclear division

Từ đồng nghĩa

• nucleolus organizer
• nucleolus organiser
• nucleolar organizer