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Plasma membrane

Definition

noun

The cell’s outer membrane made up of a two layers of phospholipids with embedded proteins. It separates the contents of the cell from its outside environment, and it regulates what enters and exits the cell.


Supplement

In animals the plasma membrane is the outermost covering of the cell whereas in plants, fungi, and some bacteria it is located beneath the [[cell wall].


Word origin: plasma: from Greek, from plassein, to mold.

Synonym: cell membrane, plasmalemma.
See also: fluid mosaic model.


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Multicellular prokaryote

... makes perfect sense. Here, another question arises. Does absence of endomembrane system have to mean that it can't be multicellular?? Since prokaryotes have lot of unevenings in their plasma membrane(invaginations and outgrowths)and because of their small size, they ...

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by Sumanth001
Sat Nov 30, 2013 5:08 pm
 
Forum: Microbiology
Topic: Multicellular prokaryote
Replies: 24
Views: 17563

Intracellular membrane potential of cell and axon

In looking at simulations of resting membrane changes to a neuron in low Na+ ECF solution, I see that the membrane potential ... the case? The cell body and axon are part of the same neuron and share the same plasma membrane ... and therefore, the intracellular readings should always be the ...

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by ayong1970
Fri Sep 07, 2012 6:43 pm
 
Forum: Physiology
Topic: Intracellular membrane potential of cell and axon
Replies: 1
Views: 5278

Re: Can you explain the Ras recruitment system?

... which interacts with a certain switch which is already fused to the plasma membrane. My questions are: 1) is the cdc25-2 yRAS mutant already attached to the plasma membrane, ...

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by janapix
Mon Jun 11, 2012 3:33 am
 
Forum: Molecular Biology
Topic: Can you explain the Ras recruitment system?
Replies: 1
Views: 1855

caveolae and caveolin1

... type of lipid raft, are small (50–100 nanometer) invaginations of the plasma membrane in many vertebrate cell types, especially in endothelial cells and adipocytes. have ...

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by taruntbiotech
Mon May 14, 2012 5:10 pm
 
Forum: Cell Biology
Topic: caveolae and caveolin1
Replies: 1
Views: 2550

Glycocalyx

... is glycocalyx only found on the extracellular of the cell surface membrane?" should I answer it like: cause glycocalyx can't be formed ... btw, just realize, are there any glycocalyx formed on the organelles' plasma membrane? Organelles are also found in the cell and don't they require ...

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by gqh
Sun May 13, 2012 12:07 am
 
Forum: General Discussion
Topic: Glycocalyx
Replies: 2
Views: 3348
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