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  2. Archaea - Wikipedia

    en.wikipedia.org/wiki/Archaea

    They called these groups the Urkingdoms of Archaebacteria and Eubacteria, though other researchers treated them as kingdoms or subkingdoms. Woese and Fox gave the first evidence for Archaebacteria as a separate "line of descent": 1. lack of peptidoglycan in their cell walls, 2. two unusual coenzymes, 3. results of 16S ribosomal RNA gene

  3. Bacteria - Wikipedia

    en.wikipedia.org/wiki/Bacteria

    They live on and in plants and animals. Most do not cause diseases, are beneficial to their environments, and are essential for life. [4] [33] The soil is a rich source of bacteria and a few grams contain around a thousand million of them. They are all essential to soil ecology, breaking down toxic waste and recycling nutrients.

  4. Eukaryote - Wikipedia

    en.wikipedia.org/wiki/Eukaryote

    They constitute a major group of life forms alongside the two groups of prokaryotes: the Bacteria and the Archaea. Eukaryotes represent a small minority of the number of organisms, but given their generally much larger size, their collective global biomass is much larger than that of prokaryotes.

  5. Kingdom (biology) - Wikipedia

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

    It was also found that the eukaryotes are more closely related to the Archaea than they are to the Eubacteria. Although the primacy of the Eubacteria-Archaea divide has been questioned, it has been upheld by subsequent research. [22] There is no consensus on how many kingdoms exist in the classification scheme proposed by Woese.

  6. 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.

  7. Two-domain system - Wikipedia

    en.wikipedia.org/wiki/Two-domain_system

    With it they proposed the existence of four kingdoms, based on the structure and composition of the ribosomal subunits, namely Archaebacteria, Eubacteria, Eukaryote and Eocyta [19] Lake further analysed the rRNA sequences of the four groups and suggested that eukaryotes originated from eocytes, and not archaebacteria, as was generally assumed. [20]

  8. Bacterial phyla - Wikipedia

    en.wikipedia.org/wiki/Bacterial_phyla

    Bacterial phyla constitute the major lineages of the domain Bacteria.While the exact definition of a bacterial phylum is debated, a popular definition is that a bacterial phylum is a monophyletic lineage of bacteria whose 16S rRNA genes share a pairwise sequence identity of ~75% or less with those of the members of other bacterial phyla.

  9. Eubacterium - Wikipedia

    en.wikipedia.org/wiki/Eubacterium

    Eubacterium is a genus of Gram-positive bacteria in the family Eubacteriaceae.These bacteria are characterised by a rigid cell wall.They may either be motile or nonmotile. If motile, they have a flagellu