Dictionary » A » Archaean



(Science: geology) The earliest period in geological period, extending up to the Lower silurian. It includes an azoic age, previous to the appearance of life, and an eozoic age, including the earliest forms of life.

this is equivalent to the formerly accepted term azoic, and to the eozoic of Dawson.

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Re: Bacterial Taxonomy

There probably aren't any archaea that you have to worry about. Archaea are rare, and no archaeans are known pathogens. However, if you do happen to be looking at an archaean, it may have hami instead of fimbriae. Hami are similar to fimbriae—both are long projections ...

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by wildfunguy
Tue Dec 03, 2013 12:21 am
Forum: Microbiology
Topic: Bacterial Taxonomy
Replies: 3
Views: 7192

Re: pro vs eu chromosomes

... chromosomes consist of multiple sets of linear DNA molecules. I believe eukaryotic chromosomes also have histones, which are absent in (most) non-archaean prokaryotes. Of course, eukaryotic chromosomes are housed in the nucleus and interact with the nuclear lamina.

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by awkko808
Fri Dec 16, 2011 8:31 am
Forum: Microbiology
Topic: pro vs eu chromosomes
Replies: 2
Views: 1860

Origin of the Nucleus

Raven's Biology briefly mentions that the nucleus may have originated from an archaean. Some archaea have histones and similar DNA-processing enzymes, which supports this hypothesis. I haven't seen too much research on this, though.

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by aptitude
Wed Dec 07, 2011 7:16 am
Forum: Evolution
Topic: Origin of the Nucleus
Replies: 3
Views: 3301

Re: Theories - Origin of Life

... or whether it could give rise to Darwinian natural selection. The ring-of-life hypothesis proposes that eukaryotes arose from a fusion of archaeans and bacteria. However, this hypothesis cannot explain where eukaryotes got their unique genes, and how fusion could have occurred in the two ...

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by scottie
Thu Jul 28, 2011 10:06 am
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 563
Views: 1127468

Re: are the horse and chicken related?

... the 5 kingdom system, but some do as far back as the 70's. The point is that they are genetically worlds apart. Cyanobacteria (found in the Archaean age--supposedly when life first appeared) are found to be the oldest known fossils, found in archaean age rocks from Australia dated at 3.5 ...

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by AFJ
Mon Feb 23, 2009 3:35 pm
Forum: Evolution
Topic: are the horse and chicken related?
Replies: 13
Views: 12955

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