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In the past, archaea were classified as bacteria and were called archaebacteria.But it was discovered that archaea have a distinct evolutionary history and biochemistry compared with bacteria.. The similarities are that archaea and eubacteria are prokaryotes — single-celled organisms that do not have a nucleus or organelles.


Bacteria are of two groups eubacteria and archaebacteria.The eubacteria are commonly found in soil, water and living in or on larger organisms include the gram positive and the gram negative and the cyanobacteria. Archae bacteria are a group of ancient bacteria.They are supposed to be originated just after the origin of life on earth.


Archaebacteria have ether linked membrane lipids with branched chains as compared to eubacteria. Second difference is the absence of thymine in T or TψC loop, but in eubacteria thymine is present. Otherwise Archaebacteria have lots of similarities with eubacteria, like cell size, absence of nucleus, presence of 70 S ribosomes.


Archaea have ether bonds with the branching of aliphatic acids in their lipid membrane. Eubacteria or bacteria have lipid membrane of ester bonds with fatty acids. Metabolic pathway: Archaea do not follow glycolysis or Krebs cycle but uses similar pathway. Follow glycolysis pathway and Kreb's cycle to break down glucose. Types


Main Difference – Archaebacteria vs Eubacteria. Archaebacteria and eubacteria are two domains of the kingdom: Monera, which contains the least organized unicellular prokaryotic microorganisms on earth. Both archaebacteria and eubacteria are single-celled microorganisms, which are usually called prokaryotes.


Monerans can be classified into three major groups: the eubacteria (True bacteria), cyanobacteria (blue green algae) and archaebacteria (ancient bacteria). The eubacteria are the commonly encountered bacteria in soil, water and living in or on larger organisms, and include the Gram positive and Gram negative bacteria.


Archaea & Bacteria: Similarities & Differences. ... Archaebacteria and Eubacteria ... even though archaea and bacteria share some similarities. Archaea deserve their own branch on the Tree of Life


Archaebacteria, eubacteria and cyanobacteria all belong to the kingdom monera. Archaebacteria are also termed as the primitive bacteria whereas the bacteria or the eubacteria are termed as the real or true bacterial organisms. Bacteria or eubacteria are abundantly found in soil, water, live inside and outside of larger species.


Archaea – at that time only the methanogens were known – were first classified separately from bacteria in 1977 by Carl Woese and George E. Fox based on their ribosomal RNA (rRNA) genes. They called these groups the Urkingdoms of Archaebacteria and Eubacteria, though other researchers treated them as kingdoms or subkingdoms.


Due to these peculiarities, the group Archaea is now recognized as a distinct domain of life. The present post article describe what all are the similarities and difference between Archaea, Bacteria (eubacteria) and Eukarya (eukaryote) with a comparison table for easy understanding.