Dictionary » D » Domain



noun, plural: domains

(1) (taxonomy) The highest taxonomic rank of organisms in which there are three groupings: Archaea, Bacteria and Eukarya.

(2) (zoogeography) A major faunal area of the earth's surface.

(3) (anatomy) A place in or a division of the body or a part of the body, as abdominal region.

(4) (molecular biology) A part of a molecule or structure with common physico-chemical features or properties, as in polar domain, atp-binding domain, helical domain, etc.

(5) (general) A realm of knowledge, thought, responsibility, etc., as the domain of science.


In biological taxonomy, a domain is the highest order of life classification, even higher than a Kingdom. Carl Woese introduced a three-domain system of classification in 1990 where organisms are divided into three domains: Archaea, Bacteria and Eukarya. Both the Domain Bacteria and Domain Archaea include prokaryotic organisms whereas the Domain Eukarya includes all eukaryotic organisms.

Word origin: French domaine, blend of Old French demaine (from Late Latin dominicum) and Latin dominium, property, both from dominus, lord


  • superkingdom

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Results from our forum

Bacterial Taxonomy

... Gram-negative rods. Oh nevermind, Wikipedia says they're cocci ? I thought Clostridians were rod-shaped!!! Are there any other exceptions within domain bacteria that erroneously stain positive or negative? Particularly from the deeply branching phyla, since my textbook places those phyla nearer ...

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by wildfunguy
Sat Oct 19, 2013 6:12 pm
Forum: Microbiology
Topic: Bacterial Taxonomy
Replies: 3
Views: 7252

Re: Why must we avert the genome of Eden?

... To make it worse, your argument is a slippery slope. Suggesting frequent HGT for Elysia chlorotica doesn't lead to HGT being frequent for all of domain Eukaryota. In fact, this source says that newer data is inconsistent with the HGT hypothesis, suggesting that scientists were testing the HGT ...

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by wildfunguy
Fri Oct 04, 2013 7:49 pm
Forum: Evolution
Topic: Why must we avert the genome of Eden?
Replies: 6
Views: 14678


... In summary, if they descended from a once independent organism, that could mean the introduction of a new taxa that is superordinate to the domain. However, the unused translation equipment may have been obtained through horizontal gene transfer, in which case they are not vestigial structures. ...

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by wildfunguy
Sun Sep 29, 2013 4:16 pm
Forum: Microbiology
Topic: Living or not? (viruses,viroids and prions).
Replies: 15
Views: 18137


... your matlab soultion? Then relax, because you are in the right place, with the people who know how to do their jobs. We have both developers and domain experts who watch the merits. Save time and money and benefit from high level of services, reasonable prices and common EU legislation without ...

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by matlabexperts
Sat Apr 27, 2013 11:58 am
Forum: Bioinformatics
Topic: Matlab
Replies: 0
Views: 1898


Ques1: Phosphorylation of RNA pol which are the roles of the phosphorylaton of C terminal Domain of RNA polymerase? (more than one may apply) 1. It increases the speed of transcription 2. It increase the specificity of the transcription process 3. It pauses transcription ...

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by 2468
Tue Nov 20, 2012 6:03 pm
Forum: Molecular Biology
Topic: RNA
Replies: 6
Views: 21520
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