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(yo͞okâr`ē-ōt'), a cell or organism composed of cells that have a membrane-bound nucleus and organelles (mitochondria, chloroplasts; see cellcell,
in biology, the unit of structure and function of which all plants and animals are composed. The cell is the smallest unit in the living organism that is capable of integrating the essential life processes. There are many unicellular organisms, e.g.
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, in biology) and genetic material organized in chromosomes in which the DNA is combined with histonehistone
, any of a class of protein molecules found in the chromosomes of eukaryotic cells. They complex with the DNA (see nucleic acid) and pack the DNA into tight masses of chromatin, which have the structure of coiled coils, much like a tangled telephone cord.
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 proteins. Eukaryotes are contrasted with the prokaryotes (see MoneraMonera,
taxonomic kingdom that comprises the prokaryotes (bacteria and cyanobacteria). Prokaryotes are single-celled organisms that lack a membrane-bound nucleus and usually lack membrane-bound organelles (mitochondria, chloroplasts; see cell, in biology).
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). Eukaryotes formed through the merger of prokaryotes, which predate them in the fossil record by some 2 billion years. In the five-kingdom system of classificationclassification,
in biology, the systematic categorization of organisms into a coherent scheme. The original purpose of biological classification, or systematics, was to organize the vast number of known plants and animals into categories that could be named, remembered, and
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, the eukaryotes have comprised the taxonomic kingdoms ProtistaProtista
or Protoctista
, in the five-kingdom system of classification, a kingdom comprising a variety of unicellular and some simple multinuclear and multicellular eukaryotic organisms.
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, FungiFungi
, kingdom of heterotrophic single-celled, multinucleated, or multicellular organisms, including yeasts, molds, and mushrooms. The organisms live as parasites, symbionts, or saprobes (see saprophyte).
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, Plantae (see plantplant,
any organism of the plant kingdom, as opposed to one of the animal kingdom or of the kingdoms Fungi, Protista, or Monera in the five-kingdom system of classification.
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), and Animalia (see animalanimal,
any member of the animal kingdom (kingdom Animalia), as distinguished from organisms of the plant kingdom (kingdom Plantae) and the kingdoms Fungi, Protista, and Monera in the five-kingdom system of classification.
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). In a recently proposed system they are called the eukarya and classified as an overarching group (domain) above the kingdom level.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a single- and multiple-celled plant and animal organism in which the body of the cell, in contrast to the cells of a prokaryote, is differentiated into the cytoplasm and the nucleus enclosed by a membrane. The most recent system of the organic kingdom gives the eukaryotes the rank of a superkingdom (including the animal, mushroom, and plant kingdoms) and juxtaposes them to the superkingdom of the prokaryotes.

The genetic material of the nucleus of eukaryotes is organized into chromosomes that are capable of duplication and distribution through mitosis between daughter cells. The molecular basis of the chromosomes is deoxyribonucleic acid (DNA), which is closely associated with histones and other proteins. In most eukaryotes there is a typical sexual process, with the fusion of cell nuclei during fertilization and reduction division during meiosis. The cytoplasm of the cells of eukaryotes, in contrast to that of prokaryote cells, has a complex system of membranes that form an endoplasmotic network, the Golgi apparatus, the mitochondria, and other organoids.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A cell with a definitive nucleus. Also spelled eucaryote.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
En los organismos eucariontes, la exposicion intracelular a una secuencia de dsRNA desencadena un proceso de silenciamiento post-transcripcional secuenciaespecifico en un mRNA homologo.
La era de la Biologia Molecular, la Proteomica y la Bioinformatica nos permitira no solo continuar profundizando en el conocimiento de los mecanismos involucrados, sino tambien en la busqueda de alternativas viables para controlar la interaccion de los microorganismos y los organismos eucariontes, como las plantas, los animales y el hombre, a traves de la explotacion del quorum sensing como estrategias anti-quorum sensing.
A taxonomia do yacon e classificada da seguinte maneira: superreino- Eucariontes; reinoPlantae; sub-reino- Embriofita; filo- Tracofita; superclasse- Angiosperma; classe- Dicotiledonea; ordem- Asterales; familia- Asteraceae (Compositae); genero- Smallanthus; especie- sonchifolius.
Desde eucariontes hasta humanos existen vias de desarrollo embrionario similar: reconstrucciones relacionadas a ejes corporales (A/P, D/V, asimetria) dados por los genes HOX, Wnt y Nodal entre otros o gastrulacion (ecto, meso y endodermo) pueden ser evaluados en modelos de Drosophila o Xenopus.
Empiricamente, por muchos anos los microorganismos tales como las bacterias y los hongos han sido utilizados en procesos de fermentacion; actualmente se sabe que tanto los microorganismos como las celulas de eucariontes superiores pueden ser modificados, transfiriendo unidades especificas de informacion genetica de un organismo a otro para obtener organismos modificados con propiedades nuevas y utiles para el ser humano (Glick y Pasternak, 1998).