Plasma Membrane

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ntpt
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Plasma Membrane

Post by ntpt » Sat Feb 18, 2006 3:53 am

Hello!
Does anyone know wat the fluid part of plasma membrane is called?

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victor
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Post by victor » Sat Feb 18, 2006 5:03 am

It's cholesterol in animal cecll membrane or Hopanoids in bacteria ceell membrane...
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cool A-level student
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Post by cool A-level student » Thu Feb 23, 2006 11:53 am

find the fluid mosaic model in any decent text book and look up cholesterol and its structure in the pages next to it that should tell u all you need ;)

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MrMistery
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Post by MrMistery » Thu Feb 23, 2006 6:14 pm

Remember plants... They do make up some of the world's organisms. Plants have something called phytosterol insted of cholesterol.

And another thing a think should be added: hopanois is only found in 1-2 genus of bacteria.. The rest of them don't have any steroids in their membranes.
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Navin
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Post by Navin » Fri Feb 24, 2006 11:22 am

Well actually the fluid part is the phospholipid bilayer because the phospholipids are not stationary - they are constantly moving.
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Post by 2810712 » Fri Feb 24, 2006 1:18 pm

yes, i heard some small sized proteins are also moving...

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MrMistery
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Post by MrMistery » Fri Feb 24, 2006 6:23 pm

Oh yes, how silly of me. I just corrected the other posts without reading the initial question.
Yes, the fluid part of the fluid mosaic is made out of the phopholipids. They can move laterally. In a cell, phospholipids move laterally about 10^7 times a second.
Proteins are also capable of lateral difusion. this has nothing to do with their size, it has to do with wether or not the protein is attached to an extracellular protein or a cytoskeleton molecule etc.
Of course a big protein will move more slowly, but, if it is free, it will still move..

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Andrew
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Post by 2810712 » Sat Feb 25, 2006 5:56 am

it really helped...










hrushikesh

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