Title: Archaebacteria | Infoplease
Headings: Archaebacteria
Archaebacteria
Content: Archaebacteria | Infoplease
Breadcrumb
Home >
Columbia Encyclopedia >
Plants and Animals >
Microbes, Algae, and Fungi >
Moneran and Protistan >
Archaebacteria
Cite
Archaebacteria
Enter your search terms: Archaebacteria är˝kēbăktĭr´ēə [ key], diverse group of bacteria (prokaryotes), sometimes called the archaea and considered a major group unto themselves. Archaebacteria are contrasted with the Eubacteria, from which they differ biochemically in the arrangement of the bases in their ribosomal RNA and in the composition of their plasma membranes and cell walls. There are three major known groups of Archaebacteria: methanogens, halophiles, and thermophiles. The methanogens are anaerobic bacteria that produce methane. They are found in sewage treatment plants, bogs, and the intestinal tracts of ruminants. Ancient methanogens are the source of natural gas. Halophiles are bacteria that thrive in high salt concentrations such as those found in salt lakes or pools of sea water. Thermophiles are the heat-loving bacteria found near hydrothermal vents and hot springs.