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Archaebacteria

Definition

noun, singular: archaebacterium

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


Supplement

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: 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: 560
Views: 906963

Re:

... : 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?
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--> 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
 
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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
 
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Topic: characteristics of the six kingdoms
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Re: characteristics of the six kingdoms

I dont think there is any need of 6th kingdom as it is easily classified with 5 kingdoms taking eubacteria and archaebacteria in the kindom monera. Maybe as one domain "Prokarya" to go with the already-existing Eukarya, but as kingdoms I think they're different enough ...

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by EASTstroudsburg13
Thu Sep 17, 2009 8:08 pm
 
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