mention the different classes of archaebacteria on the basis of its habitant and mode of nutrition
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Archaebacteria are a type of single-cell organism which are so different from other modern life-forms that they have challenged the way scientists classify life.
Until the advent of sophisticated genetic and molecular biology studies allowed scientists to see the major biochemical differences between archaebacteria and “normal” bacteria, both were considered to be part of the same kingdom of single-celled organisms. “Kingdoms,” a way of organizing life forms based on their cell structure, traditionally included Animalia, Planitia, Fungi, Protista (for single-celled eukaryotes), and Monera (which was once considered to hold all forms of prokaryotes).
However, genetic and biochemical studies of bacteria soon showed that one class of prokaryotes was very different from “modern” bacteria, and indeed from all other modern life forms. Eventually named “archaebacteria” from “archae” for “ancient,” these unique cells are thought to be modern descendants of a very ancient lineage of bacteria that evolved around sulfur-rich deep sea vents.
Sophisticated genetic and biochemical analysis has led to a new “phylogenetic tree of life,” which makes use of the concept of “domains” to describe divisions of life that are bigger and more basic than that of “kingdom.”
The most modern version of this system shows all eukaryotes – animals, plants, fungi, and protists – constituting the domain of “Eukaryota,” while the more common and modern branching of bacteria constitutes “Prokarya,” and archaebacteria constitute their own domain altogether – the domain of “Archaea.”
Until the advent of sophisticated genetic and molecular biology studies allowed scientists to see the major biochemical differences between archaebacteria and “normal” bacteria, both were considered to be part of the same kingdom of single-celled organisms. “Kingdoms,” a way of organizing life forms based on their cell structure, traditionally included Animalia, Planitia, Fungi, Protista (for single-celled eukaryotes), and Monera (which was once considered to hold all forms of prokaryotes).
However, genetic and biochemical studies of bacteria soon showed that one class of prokaryotes was very different from “modern” bacteria, and indeed from all other modern life forms. Eventually named “archaebacteria” from “archae” for “ancient,” these unique cells are thought to be modern descendants of a very ancient lineage of bacteria that evolved around sulfur-rich deep sea vents.
Sophisticated genetic and biochemical analysis has led to a new “phylogenetic tree of life,” which makes use of the concept of “domains” to describe divisions of life that are bigger and more basic than that of “kingdom.”
The most modern version of this system shows all eukaryotes – animals, plants, fungi, and protists – constituting the domain of “Eukaryota,” while the more common and modern branching of bacteria constitutes “Prokarya,” and archaebacteria constitute their own domain altogether – the domain of “Archaea.”
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