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Procaryote

Definition

noun, plural: procaryotes

Any of the group of organisms primarily characterized by the lack of true nucleus and other membrane-bound cell compartments: such as mitochondria and chloroplasts, and by the possession of a single loop of stable chromosomal DNA in the nucleiod region and cytoplasmic structures, such as plasma membrane, vacuoles, primitive cytoskeleton, and ribosomes.


Supplement

Procaryotes do not have a well-defined nucleus but a nucleoid region in their cytoplasm where their genetic material occurs generally as a single, circular molecule of DNA.

Procaryotes are usually small in size, therefore, have a large surface area to volume ratio. Thus, they have high metabolic rate and high growth rate. They generally reproduce asexually, which is by binary fission or budding.

Most of them are unicellular, others are capable of forming stable aggregate communities.

Procaryotes belong to Kingdom Monera. Examples of procaryotes are bacteria, archaea and cyanobacteria (blue-green algae).


Word origin: from the Old Greek pro-, before + karyon, nut or kernel, referring to the cell nucleus, + suffix -otos, pl. -otes;

Related forms: procaryotic (adjective).

Variant: prokaryote.

Compare: eucaryote.
See also: bacteria.


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Where did life start?

... do you think els, tell me so! If yuo have other suggestion you can tell me about it because I'm intersting about the life and specilly the passage procaryote to eucaryote.

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by BIRKHADEM
Sat Nov 21, 2009 11:45 am
 
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The Fiber Disease

... bacteria and a eukaryotic organism." Now, if this neocallimastigales is used as a model, and lateral transfer of genes between bacteria(procaryote) and "eukaryotic organism" then here is the LINK between one celled and multicelled organisms, since humans are multicelled. SO ...

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by Skytroll
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... for the production of the insecticidal Bacillus proteins within host cyanobacteria. Although both cyanobacteria and bacteria are members of the procaryote n2 kingdom, the cyanobacteria (which in the past have been referred to as "blue-green algae") are unique among procaryotes in that ...

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by London
Mon Feb 06, 2006 11:54 pm
 
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Topic: The Fiber Disease
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The Fiber Disease

... protozoa, a butterfly(lepidoptera) and a mammal specie" That's a lot of fusions. Whatever these are supposed to be: chimera organism (beteween procaryote and eucaryote that would something new), gene transfer (but which genes?) "The fibers constitute protein. Specks are chitin like polymers. ...

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by bugsonthewire
Mon Jan 02, 2006 1:13 pm
 
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Topic: The Fiber Disease
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The Fiber Disease

... protozoa, a butterfly(lepidoptera) and a mammal specie" :!: That's a lot of fusions. Whatever these are supposed to be: chimera organism (beteween procaryote and eucaryote that would something new), gene transfer (but which genes?) "The fibers constitute protein. Specks are chitin like polymers. ...

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by canalon
Fri Oct 14, 2005 3:11 pm
 
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