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Questions tagged [archaea]

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7
votes
1answer
4k views

Why are there no known photosynthetic archaea?

I'm taking a microbial physiology course and we noted that, while some archaea are phototrophic, there are no known photosynethetic archaea. Are there any physiological characteristics that make ...
7
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2answers
231 views

Are there any pathogenic archaeans?

Most textbooks seems to restrict pathogens to the domains bacteria and eukarya. Are there any pathogenic archaeans?
4
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1answer
64 views

Is it unusual for populations of archaea to be found living inside trees?

The NPR News article and podcast Getting Fire From A Tree Without Burning The Wood begins with A scientist walks up to a cottonwood tree, sticks a hollow tube in the middle and then takes a lighter ...
3
votes
1answer
716 views

Stability of the chromosomes of thermophilic bacteria

We know thermophiles — generally archaebacteria — can survive high temperature, but their genomic DNA also contains hydrogen-bonded nitrogen bases. Why don't they collapse like ordinary hydrogen bonds?...
2
votes
1answer
119 views

Aerobe or facultative anaerobe organism that metabolizes acetate?

I'm assuming bacteria, but will take any suggestions. Organism must survive primarily on the acetate (plus trace elements), but I can give/take electrons, if necessary. Not interested in strict ...
2
votes
0answers
211 views

“Antibiotic resistance” equivalent in archaea for selection during cloning

I'm beginning to work with halophilic archaea and I'm trying to figure out a good way to select for cells that have taken up a plasmid. Obviously, one can't use antibiotic resistance since they are ...
2
votes
0answers
62 views

What do we know about the cellular structure, processes, environment, and immediate ancestors of the last universal common ancestor (LUCA)? [closed]

I am up for all scientifically sound speculations, and sources are highly welcome. I've looked into this quite a bit myself via scholar.google, the wiki article, and /r/askscience. I'm really looking ...
1
vote
1answer
15k views

Do Archaea have membrane-bound organelles?

From Campbell Ch. 6 Intro to the Cell, Which of the following statements concerning bacteria and archaea cells is correct? A) Archaea cells contain small membrane-enclosed organelles; bacteria do ...
1
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2answers
2k views

What are the evidence that all life today descended from a common ancestor (LUCA), and which organisms (if any) challenge the concept?

If I understand correctly, the concept of the LUCA (last universal common ancestor) is based on the hypothesis that archaea and bacteria share common ancestry. In the realm of mathematics, the same ...
1
vote
1answer
37 views

Where in this photo can I find archaea?

This photo is from Guide to the Six Kingdoms of Life under Archaebacteria: It's not obvious to me where I can find archaea in this photo, although the website seems to indicate it's clear. Question: ...
1
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0answers
112 views

Enrichment of slow growing microbes: Large Test Tubes as an alternative?

Well, i would like to enrich bacterial and archaeal ammonia oxidisers from soil samples using Minimal Salt media. They are slow growing microbes. I would like to enrich them with the aim to produce ...
0
votes
1answer
88 views

Similarity between the human genome and archea genome in deep sea hydrothermal vents?

I'm trying to find some reference that shows what percentage of the human genome is similar to some organism from the domain Archea that lives near or on deep sea hydrothermal vents. Can someone ...
-1
votes
1answer
118 views

Why do archaea survive better in extremes than bacteria?

Why have bacteria not evolved to fill the extreme environments to the same extent as archaea? What has enabled archaea to colonize these areas when bacteria do not?