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What is an eukaryote in biology?
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The eukaryotes (/ j uː ˈ k ær i oʊ t s,-ə t s / yoo-KARR-ee-ohts, -əts) constitute the domain of Eukarya or Eukaryota, organisms whose cells have a membrane-bound nucleus. All animals, plants, fungi, and many unicellular organisms are eukaryotes.
- Holozoa
Holozoa (from Ancient Greek ὅλος (holos) 'whole', and ζῷον...
- Holomycota
Holomycota or Nucletmycea are a basal Opisthokont clade as...
- Eukaryogenesis
[1] [2] The eukaryotes form a domain that contains all...
- Three-domain system
Domain Eukarya. Eukaryota are organisms whose cells contain...
- Holozoa
Apr 19, 2024 · eukaryote, any cell or organism that possesses a clearly defined nucleus. The eukaryotic cell has a nuclear membrane that surrounds the nucleus, in which the well-defined chromosomes (bodies containing the hereditary material) are located.
- The Editors of Encyclopaedia Britannica
- Structure
- Origin
- Etymology
Eukaryotic cells are usually much bigger than prokaryotes. They can be up to 10 times bigger. Eukaryote cells have many different internal membranes and structures, called organelles. They also have a cytoskeleton. The cytoskeleton is made up of microtubules and microfilaments. Those parts are very important in the cell's shape. Eukaryotic DNA is p...
Because the cell organelles of eukaryotes have different (polyphyletic) origins, the question arises as to whether the group is a unified clade or not. It is certain that the protistsare not. Cell organelles are specialised units which carry out well-defined functions, like mitochondria and plastids. It is fairly clear now that all or most of these...
The feature that defines eukaryotes is that their cells have nuclei. Eukaryote comes from the Greek words εὖ (eu, "well" or "good") and karyon, "nut" or "kernel", here meaning "nucleus".
Apr 28, 2017 · Last Updated: April 28, 2017. Eukaryote Definition. Eukaryotes are organisms whose bodies are made up of eukaryotic cells, such as protists, fungi, plants and animals. Eukaryotic cells are cells that contain a nucleus and organelles, and are enclosed by a plasma membrane.
The leading hypothesis for the origin of eukaryotes, called the endosymbiotic theory, is that eukaryotes arose as a result of a fusion of Archaean cells with bacteria, where an ancient Archaean engulfed (but did not eat) an ancient, aerobic bacterial cell.
[1] [2] The eukaryotes form a domain that contains all complex cells and most types of multicellular organism, including the animals, plants, and fungi. [3] [4] Symbiogenesis. In the theory of symbiogenesis, a merger of an archaean and an aerobic bacterium created the eukaryotes, with aerobic mitochondria, some 2.2 billion years ago.
Domain Eukarya. Eukaryota are organisms whose cells contain a membrane-bound nucleus. They include many large single-celled organisms and all known non-microscopic organisms. The domain contains, for example: Holomycota – mushrooms and allies; Viridiplantae – green plants; Holozoa – animals and allies; Stramenopiles – includes brown algae
