The prokaryotes have a very large group of unicellular organisms. Prokaryotes includes eubacteria and archarebacteria. They are similar in some features and different in chemical composition.

Characteristic of Eubacteria

  • Found everywhere on the earth like in the soil, water, living and non living organisms
  • Cellwall is composed of peptidoglycan and muramic acid.
  • Introns are absent
  • Types: Gram positive , Gram negative

Characteristic of Archaebacteria

  • Found in the extreme enevironment like in hot spring, ocean depth, salt brine etc
  • Cellwall is composed of pseudopeptidoglycan
  • Introns are present
  • Types: Halophiles, Methanogens, Thermophiles
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Example of Eubacteria 

  • Bacillus
  • Clostridium
  • Escherichia coli
  • Lactobacillus
  • Mycobacteria
  • Salmonella
  • Streptococcus pneumoniae
  • Sporohalobacter
  • Yersinia pestis

Example of Archebacteria

  • Ferroplasma
  • Halobacterium
  • Hermoplasma
  • Methanococcus
  • Methanobacterium formicum
  • Pyrobaculum
  • Pyrolobusfumarii
  • Pyrococcus furiosus
  • Sulfolobus acidocaldarius
  • Thermoproteus
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