Eukarya
Eukarya
Eukarya (pronounced: yoo-kar-ee-uh) is one of the three domains in the three-domain system of biological classification. The term is derived from the Greek words "eu" meaning "true" and "karyon" meaning "nut or kernel," referring to the presence of a true nucleus in these organisms.
Definition
Eukarya is a domain of organisms that have cells with a true nucleus. This nucleus is enclosed within a nuclear envelope and contains the cell's genetic material. Eukaryotic cells also contain other membrane-bound organelles, such as mitochondria and the endoplasmic reticulum.
Characteristics
Eukaryotic organisms can be unicellular or multicellular. They include organisms in the Kingdoms Plantae, Animalia, Fungi, and Protista. Eukaryotic cells are generally larger and more complex than prokaryotic cells, which belong to the domains Bacteria and Archaea.
Evolution
The origin of Eukarya is a topic of ongoing research and debate among scientists. The most widely accepted theory is the endosymbiotic theory, which proposes that eukaryotic cells evolved from a symbiotic relationship between different types of prokaryotic cells.
Related Terms
External links
- Medical encyclopedia article on Eukarya
- Wikipedia's article - Eukarya
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