Filter options:

Freebase Commons Metaweb System Types /type

Object is not asserted on this topic.

Freebase Commons Common /common

  • A eukaryote is any organism whose cells contain a nucleus and other structures enclosed within membranes. Eukaryotes are formally the taxon Eukarya or Eukaryota. The defining membrane-bound structure that sets eukaryotic cells apart from prokaryotic cells is the nucleus, enclosed by the nuclear envelope, which contains the genetic material. The presence of a nucleus gives eukaryotes their name, which comes from the Greek ευ and κάρυον. Most eukaryotic cells also contain other membrane-bound organelles such as mitochondria or the Golgi apparatus. In addition, plants and algae contain chloroplasts. Many unicellular organisms are eukaryotes, such as protozoa. All multicellular organisms are eukaryotes, including animals, plants and fungi. Cell division in eukaryotes is different from that in organisms without a nucleus. There are two types of division processes. In mitosis, one cell divides to produce two genetically identical cells. In meiosis, which is required in sexual reproduction, one diploid cell undergoes recombination of each pair of parental chromosomes, and then two stages of cell division, resulting in four haploid cells.

Freebase Commons Biology /biology