Questions tagged [archaea]

Archaea constitute a domain of single-celled microorganisms lacking cell nuclei and are therefore prokaryotes.

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What is sigma factor PvdS?

I am using MEME suite tool for de novo motif discovery and when I use TomTom to compare my motifs with known motif database, I find that my genes could potentially be upregulated or downregulated by ...
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113 views

What is the relationship between a "main" strain genome and its variant genome in archaea?

I am going to analyze DNA sequencing data in order to try to extrapolate some information about the survival strategy of Pyrococcus Furiosus to gamma irradiation, as maybe you already know from all ...
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What are the causes of gene amplification in archaea?

I was studying this article about Genome Sequencing of a Genetically Tractable Pyrococcus furiosus Strain Reveals a Highly Dynamic Genome in order to try to extrapolate some features that could ...
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What does genetically tractable strain mean?

I want to study the properties of Pyrococcus Furiosus in surving to gamma irradiation by exploiting the analysis of DNA sequencing data as a bioinformatics study. Before learning how to analyse this ...
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Is the mRNA produced constant during time?

I am doing a statistical data analysis of a dataset of P. Furiosus cells exposed to gamma radiation. For the samples exposed to gamma radiation, I have the values of mRNA produced over time. For the ...
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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?
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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: ...
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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 ...
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753 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?...
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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 ...
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239 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 ...
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113 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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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269 views

Are there any pathogenic archaeans?

Most textbooks seems to restrict pathogens to the domains bacteria and eukarya. Are there any pathogenic archaeans?