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Organelle

Definition

noun, plural: organelles

A membrane-bound compartment or structure in a cell that performs a special function.


Supplement

A eukaryotic cell contains many organelles, for example, the nucleus, endoplasmic reticulum, golgi apparatus, mitochondria, and chloroplast (plastid). However, not all these organelles are found in only one cell or in an organism. The chloroplast, for instance, is abundant in plant cells but not in animal cells.

Prokaryotes, which were believed to have no organelles, have been recently described to possess “organelles”. Examples are carboxysome (a protein-shell compartment for carbon fixation in some bacteria), chlorosome (a light harvesting complex in green sulfur bacteria), magnetosome (found in magnetotactic bacteria), and thylakoid (in some cyanobacteria).


Word origin: New Latin organella, diminutive of Medieval Latin organum, organ of the body, from Latin, implement, tool

See also: nucleus, GERL.


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Re: Totipotent Stem Cell From Molecular Components

... of the protein as is and inside a cell(every single bond) and change the structure if needed. Last but not least, before I put the protein in the organelle I separate it from the protein synthesis enzymes using a centrifuge. As far as the DNA side of things first I do DNA extraction(in this case ...

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by caters
Fri Aug 01, 2014 1:42 am
 
Forum: Cell Biology
Topic: Totipotent Stem Cell From Molecular Components
Replies: 2
Views: 2759

Re: Please help me decide which microscope to buy

... if you are working with flasks and need to keep them sterile during observation. If you need high-resolution images, down to the level of organelle structure, you will likely need to stain the cells anyway and will probably need a fluorescent microscope. A working cell bio lab is likely ...

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by jonmoulton
Wed Nov 06, 2013 8:00 pm
 
Forum: General Discussion
Topic: Please help me decide which microscope to buy
Replies: 2
Views: 1580

Re: prokartotes

There is also the thylakoid membrane of a cyanobacterium which might qualify, but whether or not to call that an organelle would likely ignite semantic argument.

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by jonmoulton
Tue Sep 03, 2013 4:29 pm
 
Forum: Cell Biology
Topic: prokartotes
Replies: 4
Views: 2076

prokartotes

do prokaryotic cells have organelles??? by definition they have no membrane bound organelles but i think they dont have any at all. i think that the whole cell can be consisdered as a specialised organelle. endosymbiosis also suggests ...

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by Avishek890
Sun Sep 01, 2013 6:13 am
 
Forum: Cell Biology
Topic: prokartotes
Replies: 4
Views: 2076

Re: How did endosymbionts coordinate replication?

... the endosymbiontic theory mitochondria were ancient bacteria that survived in an ancient eukaryotic cell and continued to live as part of it as an organelle. So, I suppose, in any eukaryotic cell the mtDNA should be relatively conserved. However, the mutational rate of mtDNA is ten fold higher ...

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by kk
Tue Feb 26, 2013 8:29 am
 
Forum: Cell Biology
Topic: How did endosymbionts coordinate replication?
Replies: 9
Views: 4405
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