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Dictionary » P » Plasma membrane

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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Mammalian Gametes

... are silenced till fertilization. It also has vesicles just under the plasma membrane that will release enzymes upon one sperm contact and prevent polyspermy from happening. ...

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by kolean
Wed Sep 02, 2009 10:41 pm
 
Forum: Cell Biology
Topic: Mammalian Gametes
Replies: 3
Views: 48

Hope you guys can answer this.

hi Which of the following statements is UNTRUE? (a) The plasma membrane is a bilayer of lipid molecules. yes (b) The nucleus is surrounded by an envelope. yes ...

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by Leela
Wed Aug 26, 2009 4:42 pm
 
Forum: Cell Biology
Topic: Hope you guys can answer this.
Replies: 2
Views: 74

Hope you guys can answer this.

... PLease help me. Which of the following statements is UNTRUE? (a) The plasma membrane is a bilayer of lipid molecules. (b) The nucleus is surrounded by an envelope. (c) ...

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by cpu2007
Sun Aug 23, 2009 1:14 pm
 
Forum: Cell Biology
Topic: Hope you guys can answer this.
Replies: 2
Views: 74

Explain protein transport plz

... Inside the ER, the newly made protein/enzyme will bud off from the ER's membrane forming its own secretory membrane around it to keep it from being ... (exocytosis), or incorporation of receptor proteins into the cell's plasma membrane itself (vesicle's membrane intergrates into the cell's plasma ...

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by kolean
Sat Aug 22, 2009 8:15 pm
 
Forum: Cell Biology
Topic: Explain protein transport plz
Replies: 2
Views: 58

plasma membrane replentishing Question

... following cells are most likely to be engaged in continually replacing membrane from its plasma membrane, and erythrocyte, a pancreatic acinar cell, or a macrophage? Why? A: I always ...

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by NewtoBiology
Wed Jul 22, 2009 10:07 pm
 
Forum: Cell Biology
Topic: plasma membrane replentishing Question
Replies: 1
Views: 122
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