karyon
Học thuậtThân thiện
Definition
Noun: * The central, membrane-bound structure in eukaryotic cells that contains the genetic material (DNA and RNA) and controls cellular growth and reproduction. It is the primary distinguishing feature of eukaryotic organisms (plants, animals, fungi, protists).
Usage
- The term "karyon" is a scientific synonym for "cell nucleus." It is used primarily in formal biological and cytological contexts.
- It is the root for terms like "eukaryote" (organism with a true nucleus) and "prokaryote" (organism without a nucleus).
Examples
- Under the microscope, the karyon was clearly visible as a dense, spherical region within the cell.
- The primary function of the karyon is to safeguard and regulate access to the cell's genetic information.
- Biologists study the karyon to understand how genes control cellular processes.
Advanced Usage
- "Karyon" vs. "Nucleus": While often used interchangeably, "karyon" emphasizes the structure's role as the container for the genome, whereas "nucleus" is the more common general term.
- The prefix "karyo-" is used in many compound terms in cell biology (e.g., karyotype, karyokinesis).
Variants and Related Words
- Nucleus (n): The more common term for "karyon."
- Eukaryote (n): An organism whose cells contain a karyon/nucleus.
- Prokaryote (n): An organism whose cells lack a karyon/nucleus.
- Karyotype (n): The number and visual appearance of the chromosomes in the cell nucleus/karyon.
Synonyms
- Cell nucleus
- Nucleus
Antonyms
- (Conceptual) Cytoplasm (the material within a cell excluding the nucleus)
- (Organism type) Prokaryote (an organism lacking a nucleus)
Noun
- a part of the cell containing DNA and RNA and responsible for growth and reproduction