Archaea bacteria?

I need a (helpful) description of archaea... and it's not for school, don't worry. (don't say Wikipedia... I'm already there)

Archaea bacteria?
Archaea are microscopic, single-celled organisms. Being prokaryotes they have no membrane-bound organelles within their cells as you and I do, this means no nucleus, no mitochondria, no chloroplasts, etc. Their DNA is normally a single molecule circular in shape whereas our DNA comes in linear form in several or many molecules. Their ribosomes are of the 70S type, ours are of the 80S type (except in mitochondria) and chloroplasts and plasmids are relatively common. Lastly, they have no microtubule cytoskeleton








Archaea differ from bacteria in that they have histone proteins associated with their DNA as we do. Like us, they have no muramic acid in their cell walls and they use methionine as their initiator tRNA whereas bacteria use Formylmethionine. Also like us, their ribosomes are sensitive to diphtheria toxin, those in bacteria are not. They are insensitive to chloramphenicol, streptomycin and kanamycin, whereas most bacteria are sensitive to these substances. Like bacteria, some of them are capable of denitrification and nitrogen fixation but unlike bacteria none of them are capable of nitrification. Also like bacteria some of them are capable of growth at temperatures above 80(C. No eukaryotes (us, plants, etc.) are capable of this. They differ from both eukaryotes and bacteria in that their membrane lipids are ether-linked not ester-linked and in that they are capable of methanogenesis.








The associated bacteria and archaea ... participate in nutrient cycling processes of the soil. Plant roots, mycorrhizal fungi, bacteria and archaea interact with each other and together alter the soil habitat which they colonize. This assemblage of organisms, together with their soil habitat, is called the mycorrhizosphere.
Reply:This is the best I found


Good Luck





http://www.nearctica.com/nathist/miscani...
Reply:Research the archaea with the word archaebacteria, you'll get more refined results. Archaebacteria doesn't have that many phyla listed under it, it's helpful to research each one individually:





Korarchaeota


Nanoarchaeota


Crenarchaeota


Euryarchaeota





Here's a couple decent articles:


http://www.sparknotes.com/biology/microo...


http://www.wisegeek.com/what-are-archaeb...


http://www.ucmp.berkeley.edu/archaea/arc...
Reply:Try the website below.





Archae are phylogenetic domain of prokaryotic organisms based on rDNA first established by Woese.





These are deeply branching organisms and are likely closely related to the first organisms on earth.





They consist of methanogens, most known extreme halophiles (high salinity) and hyperthermophiles (high temp).





If you have access to "Biology of Microorganisms" by Brock, you will find everything you need.

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