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  2. Three-domain system - Wikipedia

    en.wikipedia.org/wiki/Three-domain_system

    The three-domain system adds a level of classification (the domains) "above" the kingdoms present in the previously used five- or six-kingdom systems.This classification system recognizes the fundamental divide between the two prokaryotic groups, insofar as Archaea appear to be more closely related to eukaryotes than they are to other prokaryotes – bacteria-like organisms with no cell nucleus.

  3. Archaea - Wikipedia

    en.wikipedia.org/wiki/Archaea

    The archaeal phospholipids are built on a backbone of sn-glycerol-1-phosphate, which is an enantiomer of sn-glycerol-3-phosphate, the phospholipid backbone found in bacteria and eukaryotes. This suggests that archaea use entirely different enzymes for synthesizing phospholipids as compared to bacteria and eukaryotes.

  4. Bacterial taxonomy - Wikipedia

    en.wikipedia.org/wiki/Bacterial_taxonomy

    These lineages were formalised into the rank Domain (regio in Latin) which divided Life into 3 domains: the Eukaryota, the Archaea and the Bacteria. [2] In 2023, the Prokaryotic Code added the ranks of domain and kingdom to the prokaryotic nomenclature. The names of Bacteria and Archaea are validly-published taxa following Oren and Goker's ...

  5. Two-domain system - Wikipedia

    en.wikipedia.org/wiki/Two-domain_system

    The tree of life. Two domains of life are Bacteria (top branches) and Archaea (bottom branches, including eukaryotes). The two-domain system is a biological classification by which all organisms in the tree of life are classified into two domains, Bacteria and Archaea.

  6. Kingdom (biology) - Wikipedia

    en.wikipedia.org/wiki/Kingdom_(biology)

    Prokaryota have two kingdoms: Bacteria and Archaea. (This was based on the consensus in the Taxonomic Outline of Bacteria and Archaea, and the Catalogue of Life). The Eukaryota have five kingdoms: Protozoa, Chromista, Plantae, Fungi, and Animalia. In this classification a protist is any of the eukaryotic unicellular organisms. [17]

  7. Domain (biology) - Wikipedia

    en.wikipedia.org/wiki/Domain_(biology)

    A speculatively rooted tree for RNA genes, showing major branches Bacteria, Archaea, and Eukaryota The three-domain tree and the eocyte hypothesis (two-domain tree), 2008. [7] Phylogenetic tree showing the relationship between the eukaryotes and other forms of life, 2006. [8] Eukaryotes are colored red, archaea green, and bacteria blue.

  8. Marine prokaryotes - Wikipedia

    en.wikipedia.org/wiki/Marine_prokaryotes

    Cellular life forms can be divided into prokaryotes and eukaryotes. Prokaryotes are bacteria or archaea, and the diagram shows some (clickable) parts shared by both. But bacteria and archaea also have fundamental differences, as indicated by their placement in different domains.

  9. Eukaryote - Wikipedia

    en.wikipedia.org/wiki/Eukaryote

    The eukaryotes seemingly emerged within the Asgard archaea, and are closely related to the Heimdallarchaeia. [5] This implies that there are only two domains of life, Bacteria and Archaea, with eukaryotes incorporated among the Archaea. Eukaryotes first emerged during the Paleoproterozoic, likely as flagellated cells.