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A eukaryote is an organism whose cells contain complex structures enclosed within membranes. The defining membrane-bound structure that sets eukaryotic cells apart from prokaryotic cells is the nucleus, within which the genetic material is carried.
Learning Objectives. Explain the endosymbiotic theory for the origin of eukaryotes. Use evidence from the endosymbiotic theory to place the origin of mitochondria and chloroplasts on the tree of life. Identify and describe the key traits and adaptations unique to eukaryotes (Sex/Meiosis, Mitosis, Mitochondria, Nucleus, Linear chromosomes)
Definition and associated terms. History. Two kingdoms of life. Three kingdoms of life. Four kingdoms. Five kingdoms. Six kingdoms. Eight kingdoms. Six kingdoms (1998) Seven kingdoms. Summary. Beyond traditional kingdoms. Three domains of life. Eukaryotic supergroups. Comparison of top level classification. Viruses. See also. Notes. References.
A eukaryote (or eucaryote) is an organism with a complex cell or cells, in which the genetic material is organized into a membrane-bound nucleus or nuclei. Eukaryotes comprise animals, plants, and fungi —which are mostly multicellular—as well as various other groups that are collectively classified as protists (many of which are unicellular).
Of all the six eukaryote supergroups, four are exclusively composed of unicellular organisms. Unicellular organisms vary in size, with the smallest bacteria measuring only a third of a micron (300 nanometers) across, ranging up to the titanic plasmodial slime molds, which can grow to 20 cm (8 in) across.
Aug 7, 2009 · The fossil record doesn't tell us much about their origin. Paleontologists have found fossils of prokaryotes dating back 3.45 billion years. The earliest fossils that have been proposed to be eukaryotes—based on their larger size and eukaryotelike features on their surfaces—are only about 2 billion years old.
A eukaryote is an organism with complex cells, or a single cell with a complex structure. In these cells the DNA is organized into chromosomes in the cell nucleus. The term is contrasted with prokaryote
