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How many DOMAINS are used in Biology?

Updated: 8/11/2023
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12y ago

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threeA domain is a taxonomic level that supersedes kingdom, emphasizes the characteristic similarities among eukaryotic kingdoms (Protista, Plantae, Fungi, and Animalia), and discriminates between Archaea and Eubacteria. Systematists recognize 3 domains: Eukarya (membrane enclosed nucleus, organelles), Archea (numerous prokaryotic extremophiles), and Eubacteria (prokaryotic, peptidoglycan cell walls). Cladistically, Eukarya are believed to share a common ancestor with Archaea more recently than Eubacteria; evidence includes the presence of histones, introns, and the initiator amino acid Methionine (protien synthesis).

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No, Four

The answer above is outdated; the four domains are eukaryotes, bacteria, Archaea, and viruses.

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12y ago
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15y ago

Three: Bacteria, Archaea and Eukarya.

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Q: How many DOMAINS are used in Biology?
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