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eukaryote

eukaryote (yōōkâr´ē-ōt´), a cell or organism composed of cells that have a membrane-bound nucleus and organelles (mitochondria, chloroplasts; see cell, in biology) and genetic material organized in chromosomes in which the DNA is combined with histone proteins. Eukaryotes are contrasted with the prokaryotes (see Monera). 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 classification, the eukaryotes have comprised the taxonomic kingdoms Protista, Fungi, Plantae (see plant), and Animalia (see animal). In a recently proposed system they are called the eukarya and classified as an overarching group (domain) above the kingdom level.

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"eukaryote." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"eukaryote." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/eukaryote

"eukaryote." The Columbia Encyclopedia, 6th ed.. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/eukaryote

eukaryote

eukaryote Organism whose cells have a membrane-bound nucleus, with DNA contained in chromosomes. Making up one of the three domains, eukaryotes include all animals, plants, fungus, and Protoctista. They have a complex cytoplasm with an endoplasmic reticulum, and most of them possess mitochondria. Most plants and algae also possess chloroplasts. Other structures specific to eukaryotic cells include microtubules, Golgi bodies, and membrane-bound flagella. See also Golgi body; kingdom; mitochondrion; prokaryote

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"eukaryote." World Encyclopedia. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"eukaryote." World Encyclopedia. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/eukaryote

"eukaryote." World Encyclopedia. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/eukaryote

eukaryote

eukaryote An organism whose cells have a distinct nucleus enveloped by a double membrane, and other features including double-membraned mitochondria and 80S ribosomes in the fluid of the cytoplasm (i.e. all protists, fungi, plants, and animals). The first eukaryotes were almost certainly green algae (Chlorophyceae) and what appear to be their microscopic remains appear in Proterozoic sediments dating from a little less than 1500 Ma ago.

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"eukaryote." A Dictionary of Ecology. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"eukaryote." A Dictionary of Ecology. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/eukaryote-0

"eukaryote." A Dictionary of Ecology. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/eukaryote-0

eukaryote

eukaryote An organism comprising cells that have a distinct nucleus enveloped by a double membrane, and other features including double-membraned mitochondria and 80S ribosomes in the fluid of the cytoplasm (i.e. all protists, fungi, plants, and animals). The first eukaryotes were almost certainly green algae, and what appear to be their microscopic remains appear in Precambrian sediments dating from a little less than 1500 Ma ago.

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"eukaryote." A Dictionary of Zoology. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"eukaryote." A Dictionary of Zoology. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/eukaryote-2

"eukaryote." A Dictionary of Zoology. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/eukaryote-2

eukaryote

eukaryote (adj. eukaryotic) Organism with cells that have a distinct nucleus, i.e. all protists, fungi, plants, and animals. The first eukaryotes were almost certainly green algae (Chlorophyta), and what appear to be their microscopic remains appear in Precambrian sediments dating from a little less than 1500 Ma ago. Compare PROKARYOTE.

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"eukaryote." A Dictionary of Earth Sciences. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"eukaryote." A Dictionary of Earth Sciences. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/eukaryote

"eukaryote." A Dictionary of Earth Sciences. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/eukaryote

eukaryote

eukaryote An organism whose cells have a distinct nucleus (i.e. all protists, fungi, plants, and animals). The first eukaryotes were almost certainly green algae (Chlorophyceae) and what appear to be their microscopic remains occur in Precambrian sediments dating from a little less than 1500 Ma ago.

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"eukaryote." A Dictionary of Plant Sciences. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"eukaryote." A Dictionary of Plant Sciences. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/eukaryote-1

"eukaryote." A Dictionary of Plant Sciences. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/eukaryote-1

eukaryote

eukaryote (eucaryote) An organism consisting of cells in which the genetic material is contained within a distinct nucleus. All organisms except bacteria are eukaryotes. See Eukarya. Compare prokaryote.

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"eukaryote." A Dictionary of Biology. . Encyclopedia.com. 12 Dec. 2017 <http://www.encyclopedia.com>.

"eukaryote." A Dictionary of Biology. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/eukaryote-3

"eukaryote." A Dictionary of Biology. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/eukaryote-3