What is the Three Domains of Life?
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Three Domains of Life
(i) Archaea Archaea domain includes prokaryotic
organisms. These are characterised by a monolayer
core of lipids in the cell membrane and distinct
nucleotides in their 16 S RNA.
It contains a single kingdom called Archaebacteria.
Kingdom—Archaebacteria This kingdom includes
early prokaryotes, which live in extreme conditions
of the environment.
Include methanogens,
halophiles and thermoacidophiles.
(ii) Bacteria The bacteria domain consists of typical
prokaryotes that lack membrane covered cell
organelles. These do not have microchambers for
separating various metabolic activities. It also has a
single kingdom—Eubacteria.
Kingdom—Eubacteria The members of this
kingdom have peptidoglycan cell wall, naked DNA
in coiled form and glycogen food reserves. The sap
vacuole is not present and 70 S ribosomes are
present. The members of this kingdom are bacteria,
mycoplasma,
rickettsiae,
spirochaetes, cyanobacteria.
(iii) Eukarya The domain eukarya contains all the
eukaryotes. The four kingdoms of this domain are
Protista, Fungi, Plantae and Animalia