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mechanisms of membrane transport

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mechanisms of membrane transport

Postby Tye707 » Tue Feb 10, 2009 1:18 am

so a queston on my reveiw sheet asks
describe the mechanisms of membrane transport.

my answer: diffusion:passive movement of molecules, high consentate to low consentrate
osmosis:a low solute cosentration to high solute consentration
carrier transport: protein with cell membrane
bulk transport: substense intake

are my answers correct to the question? i dont understand the question
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Postby mith » Fri Feb 13, 2009 6:18 pm

they probably want you to describe carrier transport in more detail, including something about conformational changes.
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Re: mechanisms of membrane transport

Postby sapphirearth » Fri Mar 13, 2009 5:28 am

your answers are correct but for osmosis my teacher said a better way to put it is:
osmosis: the movement of free water molecules from a region of high free water molecules to a region of low free water molecules.

endocytosis/exocytosis -movement of large molecule into and out of the cell respectively via invagination (or folding) of the cell membrane. The memebrane forms vesicles around the large molecule.

active transport- can be in either protein channels or carrier proteins but go from low to high concentration and energy is expended.

channel proteins-generally transport ions (charged particles) through the cell membrane

for diffusion there is also lots of ways , you may like to elaborate like describe how lipid soluble molecules would dissolve through the lipid bilayer of the membrane. And how small molecules like urea , water and carbon dioxide sqeeze through the phospholipid heads to travel thorugh

hope this helps..
and good luck :)
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Re: mechanisms of membrane transport

Postby whawth » Tue Oct 06, 2009 7:39 pm

Good answer but I think it is more looking for like exocytosis how a vacuole move objects in or out in the case of endocytosis
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Postby MrMistery » Wed Oct 07, 2009 12:30 am

what about protein translocation?

Problem: you have a protein one side of a membrane and you want to get it on the other side. How do you do it?
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Re: mechanisms of membrane transport

Postby kbyars10 » Wed Oct 07, 2009 7:19 pm

I liked you example of endocytosis and exocytosis! :wink:
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