Endocytosis

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ntpt
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Endocytosis

Post by ntpt » Mon Feb 20, 2006 6:09 am

Does the formation of vesicles by endocytosis reduce the size of the plasma membrane?

army
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Post by army » Mon Feb 20, 2006 6:26 am

I suppose yes, a bit.
But then it will be normal again after exocytosis. :oops:

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Poison
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Post by Poison » Mon Feb 20, 2006 2:25 pm

Yes. That's right generally.
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Post by cool A-level student » Thu Feb 23, 2006 11:39 am

do not the vesicles return inside the cell at some point? so they can pick up more enzyme to dump outside

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Post by MrMistery » Thu Feb 23, 2006 6:26 pm

Vesicles are not recycled, i'm afraid. But the endoplasmic reticulum formes membrane lipids and proteins constantly. Interesting to know, the enzymes it formes are only put on the outer membrane, so without flipases the membranes would lose it's integrity. This as a counter argument for the people who say "flip-flop is rare so we don't have to learn about it"
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Post by th1_rhs13 » Sun Feb 26, 2006 11:08 am

Discuss this flip-flip notion further. Im not aware of any such attribute or activity. To my knowledge Actin and intermediate filaments are what gave cells their structure.

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Post by MrMistery » Sun Feb 26, 2006 5:08 pm

where they are 2 totally different things. The cytoskeleton gives the shape it's shape and contributes to mobility.
Flip-flop is the movement of lipids from one side of the bilayer to the other. It requires ATP and it is catalysed by enzymes known as flipases or phospholipid translocases. It occurs about once a month - very rare. i'm sorry i have no time to explain it further.
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Post by tommiekiddy » Tue Mar 07, 2006 1:14 pm

it is a process in which a substance gains entry into a cell without passing through the cell membrane
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Re: Endocytosis

Post by slindsey » Wed Oct 07, 2009 7:21 pm

I didnt realize so much went on with the endoplasmic reticullum during endocytosis. :roll:

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