Dictionary » A » Archaebacteria



noun, singular: archaebacterium

Unicellular microorganisms in the domain Archaea, which is genetically distinct from bacteria and eukaryotes, and often inhabiting extreme environmental conditions.


Examples of archaebacteria include halophiles (microorganisms that may inhabit extremely salty environments), methanogens (microorganisms that produce methane), and thermophiles (microorganisms that can thrive extremely hot environments).

They evolved separately from eubacteria and eukaryotes. They are similar with eubacteria in being prokaryotes and lacking distinct cell nucleus. They differ in terms of ribosomal structure, the possession of introns and in membrane structure or composition. They are similar to eukaryotes in ways that archaea possess genes and several metabolic pathways that are more closely related to those of eukaryotes: notably the enzymes involved in transcription and translation.

Word origin: New Latin, from Greek arkhaion, neuter singular of arkhaios, ancient + bacteria.

Related forms: archaeobacteria.

Synonym: archaea.
Compare: eubacteria.

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Re: Beginner Microbiologist, looking for a place to start.

... old (five kingdom) and new (three kingdom) classifications of life, cell envelope structural differences within and between the eubacteria and archaebacteria, broad classifications of metabolism (chemoheterotroph, photoautotroph and the others), biofilms, microbioal ecology, mechanisms of gene ...

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by jonmoulton
Mon Dec 15, 2014 5:33 pm
Forum: General Discussion
Topic: Beginner Microbiologist, looking for a place to start.
Replies: 1
Views: 1077

Re: Theories - Origin of Life

... that genetic information was found to be very intermixed even across domains. Now this was initially showing up among prokaryotes (bacteria and archaebacteria) But more recent research is revealing this showing even in eukaryotic life forms, as more animal genomes are sequenced. Evidence of ...

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by scottie
Fri Jan 20, 2012 7:47 pm
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 563
Views: 1127945


... : TIG , 21(12), 647-54. Available at: http://www.molevol.de/publications/135.pdf . Some parts (such as the divergence between archaebacteria and eubacteria before the evolution of membrane synthesis) are still somewhat controversial and very open to debate, but the general ...

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by mamoru
Mon Feb 15, 2010 12:09 pm
Forum: Evolution
Topic: Is abiogenisis natuarally possible?
Replies: 10
Views: 12414

--> biology help plz

think... would a dog be in plantae or animalia? The only thing that may prove difficult would be finding the differences between the archaebacteria and eubacteria... if you google these, however, you should be able to find your answer.

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by plasmodesmata11
Fri Nov 27, 2009 11:55 pm
Forum: General Discussion
Topic: --> biology help plz
Replies: 2
Views: 1529

Re: characteristics of the six kingdoms

Plus, I had thought that Archaebacteria is more closely related to eukaryotes than the eubacteria, that it evolved from eukaryotes after evolving from eubacteria. I could be mistaken though, so don't jump on me if it's wrong. This is ...

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by JackBean
Fri Sep 18, 2009 3:48 pm
Forum: General Discussion
Topic: characteristics of the six kingdoms
Replies: 18
Views: 59167
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