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Prokaryote

Definition

noun, plural: prokaryotes

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

Prokaryotes 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.

Prokaryotes 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.

Prokaryotes belong to Kingdom Monera. Examples of prokaryotes 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: prokaryotic (adjective).

Variant: procaryote.

Compare: eukaryote.
See also: bacteria.


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Re: Multicellular prokaryote

Sumanth: I think the answer goes back to the original question, in a way. The trouble with answering the question comes down to a lack of definition of what we mean by multicellular and perhaps that more specificity is required in modern terminology because of the abundance of new information. Proka...

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by thirdprometheus
Fri Nov 15, 2013 7:45 pm
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 24
Views: 17566

Multicellular prokaryote

why do we see very few multicellular prokaryote?? is it just because of their poor organisation?? or does it have something to do with stability??

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by Sumanth001
Wed Oct 09, 2013 11:27 am
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 24
Views: 17566

Re:

Sorry for brining up an old thread but... Organisms with a defined, heritable body plan. That's perfect for ruling out prokaryotes and it is indeed met by all eukaryotes. Great definition! There are plenty of unicellular Eukaryotes. There are also multicullular Eukaryotes that don't ...

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by BlahBlahBlah
Thu Jun 27, 2013 1:46 pm
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 24
Views: 17566

Re:

... more in terms of survival by remaining as simple organisms. In many cases that is true. The most numerous organisms on the Earth are still the prokaryotes, which in many ways can be said to be "simple" organisms. So one could argue that it is the most effective form of life even in ...

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by biohazard
Fri Nov 30, 2012 8:21 am
 
Forum: Evolution
Topic: Is evolution as simple as we think?
Replies: 38
Views: 15953

Re:

... theories for which you need some proofs. So far abiogenesis looks better then God. All of the DATA that supports "tree of life" - first prokaryote, than eukaryote that somehow swallowed prokaryote giving us mitochondria and giving plants chloroplasts can be interpreted in the OPPOSITE ...

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by Cat
Thu Oct 11, 2012 2:11 am
 
Forum: Evolution
Topic: Are evolution and creationism mutually exclusive???
Replies: 24
Views: 11049
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