Dictionary » P » Prokaryote

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.


Please contribute to this project, if you have more information about this term feel free to edit this page



Results from our forum


Chicken or egg formed first

... order (follow the phylogeny), egg-chicken-egg-chicken-egg-…………..-reptiles-egg…………-amphibians-egg…………..-fishes-egg…………..-invertebrate- egg …………prokaryotes-prokaryote-prokaryote…… So very distant ancestors of chicken had no egg laying capability.

See entire post
by josem
Sun Aug 17, 2014 8:24 pm
 
Forum: Evolution
Topic: Chicken or egg formed first
Replies: 5
Views: 793

Chicken or egg formed first

Prokaryote never be chicken. But I mean chicken ultimately evolved from prokaryote within time frame of few hundred million years. So very very distant ancestor of chicken is a prokaryote.

See entire post
by josem
Wed Aug 13, 2014 7:27 pm
 
Forum: Evolution
Topic: Chicken or egg formed first
Replies: 5
Views: 793

Chicken or egg formed first

The egg! A prokaryote is certainly not a chicken! What's your agenda??

See entire post
by wildfunguy
Fri Aug 01, 2014 1:36 am
 
Forum: Evolution
Topic: Chicken or egg formed first
Replies: 5
Views: 793

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...

See entire post
by thirdprometheus
Fri Nov 15, 2013 7:45 pm
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 27
Views: 27980

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??

See entire post
by Sumanth001
Wed Oct 09, 2013 11:27 am
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 27
Views: 27980
View all matching forum results

This page was last modified 10:29, 19 February 2009. This page has been accessed 112,642 times. 
What links here | Related changes | Permanent link