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Organelles

Definition

noun, plural of organelle

Literally, the term means "little organs". As the body is composed of various organs, the cell, too, has "little organs" that perform special functions. They are membrane-bound compartments or structures of a cell.


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.


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Spontaneous formation of nuclear membrane

... each cell division? In the case mitochondria and chloroplast, the double membrane is form spontaneously because they are produced from parent organelles. Do nuclear pore complex have any role in the case of nucleus?

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by josem
Sun Jun 22, 2014 1:14 am
 
Forum: Cell Biology
Topic: Spontaneous formation of nuclear membrane
Replies: 1
Views: 500

Re: Multicellular prokaryote

... there is reason to believe that these other important characteristics are related to that and to each other: endomembrane system, membrane bound organelles, sexual reproduction (associated with diploid or more), and endocytosis. Quite literally, eukaryotic cells in their own right are thought ...

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by thirdprometheus
Fri Nov 15, 2013 7:45 pm
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 26
Views: 25171

Living or not? (viruses,viroids and prions).

... they have membranes, not mere envelopes. But, considering that they aren't free living cells, you could argue that these parasites are more like organelles, much like the mitochondria and chloroplasts that contain their own genetic materia. If viruses are infectious genetic material, then maybe ...

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by wildfunguy
Thu Oct 17, 2013 10:20 pm
 
Forum: Microbiology
Topic: Living or not? (viruses,viroids and prions).
Replies: 15
Views: 9694

prokartotes

That depends on whether or not you consider ribosomes to be organelles.

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by Cat
Sun Sep 01, 2013 2:05 pm
 
Forum: Cell Biology
Topic: prokartotes
Replies: 4
Views: 1940

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: 1940
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