eukaryote (y
kâr`ē-ōt'), a cell or organism composed of cells that have a membrane-bound nucleus and organelles (mitochondria, chloroplasts; see cell cell, 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.
..... Click the link for more information. , in biology) and genetic material organized in chromosomes in which the DNA is combined with histone histone (hĭs`tōn), any of a class of protein molecules found in the chromosomes of eukaryotic cells .
..... Click the link for more information. proteins. Eukaryotes are contrasted with the prokaryotes (see Monera Monera, 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).
..... Click the link for more information. ). 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 taxonomy, the study of the relationships of organisms, which includes collection, preservation, and study of specimens, and analysis of data provided by various areas of biological research.
..... Click the link for more information. , the eukaryotes have comprised the taxonomic kingdoms Protista Protista (prōtĭs`tə) or Protoctista
..... Click the link for more information. , Fungi Fungi (fŭn`jī), kingdom of heterotrophic single-celled, multinucleated, or multicellular organisms, including yeasts, molds, and
..... Click the link for more information. , Plantae (see plant plant, 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.
..... Click the link for more information. ), and Animalia (see animal animal, 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.
..... Click the link for more information. ). In a recently proposed system they are called the eukarya and classified as an overarching group (domain) above the kingdom level.
eukaryote [yü′kar·ē‚ōt]
kâr`ē-ōt'), a cell or organism composed of cells that have a membrane-bound nucleus and organelles (mitochondria, chloroplasts; see cell cell, 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...... Click the link for more information. , in biology) and genetic material organized in chromosomes in which the DNA is combined with histone histone (hĭs`tōn), any of a class of protein molecules found in the chromosomes of eukaryotic cells .
..... Click the link for more information. proteins. Eukaryotes are contrasted with the prokaryotes (see Monera Monera, 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).
..... Click the link for more information. ). 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 taxonomy, the study of the relationships of organisms, which includes collection, preservation, and study of specimens, and analysis of data provided by various areas of biological research.
..... Click the link for more information. , the eukaryotes have comprised the taxonomic kingdoms Protista Protista (prōtĭs`tə) or Protoctista
..... Click the link for more information. , Fungi Fungi (fŭn`jī), kingdom of heterotrophic single-celled, multinucleated, or multicellular organisms, including yeasts, molds, and
..... Click the link for more information. , Plantae (see plant plant, 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.
..... Click the link for more information. ), and Animalia (see animal animal, 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.
..... Click the link for more information. ). In a recently proposed system they are called the eukarya and classified as an overarching group (domain) above the kingdom level.
eukaryote
Any organism composed of one or more cells, each of which contains a clearly defined nucleus enclosed by a membrane, along with organelles (small, self-contained, cellular parts that perform specific functions). The organelles include mitochondria, chloroplasts, a Golgi apparatus, an endoplasmic reticulum, and lysosomes. All organisms except bacteria and archaea are eukaryotes; bacteria and archaea are prokaryotes.
eukaryote [yü′kar·ē‚ōt]
(biology)
A cell with a definitive nucleus. Also spelled eucaryote.
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