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Bacteria
Temporal range: Archean or earlier – present
EscherichiaColi NIAID.jpg
Scanning electron micrograph of Escherichia coli rods
Scientific classification e
Domain:Bacteria
Woese, Kandler & Wheelis, 1990
Phyla

Actinobacteria (high-G+C)
Firmicutes (low-G+C)
Tenericutes (no wall)

Aquificae
Bacteroidetes/FibrobacteresChlorobi (FCB group)
Chlamydiae
Deinococcus-Thermus
Fusobacteria
Gemmatimonadetes
Nitrospirae
PlanctomycetesVerrucomicrobia/Chlamydiae (PVC group)
Proteobacteria
Spirochaetes
Synergistetes

  • Unknown/ungrouped

Acidobacteria
Chloroflexi
Chrysiogenetes
Cyanobacteria
Deferribacteres
Dictyoglomi
Thermodesulfobacteria
Thermotogae

Synonyms

Eubacteria Woese & Fox, 1977

Bacteria (sing. bacterium) are very small organisms. They are prokaryotic microorganisms. Bacterial cells do not have a nucleus, and most have no organelles with membranes around them. Most have a cell wall. They do have DNA, and their biochemistry is basically the same as other living things. They are amongst the simplest and the oldest organisms. They function as independent organisms.

Almost all bacteria are so tiny they can only be seen through a microscope. Bacteria are made up of one cell, so they are a kind of unicellular organism. They are among the simplest single-celled organisms on Earth, and were one of the earliest forms of life. They include a number of extremophiles which live in extreme habitats.

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