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permeability, cell membrane architecture

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permeability, cell membrane architecture

Postby isabell » Mon Feb 06, 2006 6:07 pm

im not sure about permeability refers to:
the movement of molecules from a greater concentation to a lesser OR the extent a membrane allows a substance to pass through???

WHAT IS MADE OF THE CELL ARCHITECTURE? IS MADE OF LIPID AND PROTEIN BLOCKS ONLY?, OR IS MADE OF LIPIDS PROTEINS WITH GLYCOLIPIDS AND CHOLESTEROL?
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Postby MrMistery » Tue Feb 07, 2006 6:47 pm

Are these homework questions?
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Postby zami'87. » Tue Feb 07, 2006 8:15 pm

mainly membrane consists of phospholypids and proteins- some are glycoproteins(short sugar chain has a function in cell recognition). Cholesterol is also present:has influence on membrane fluidity-stabilizing it.

Membrane is semipermeabile(has selective permeability). Cell can take substances that are more concentrated in the cytoplasm-although energy in form of ATP is recquired. Proteins-carriers of specific molecules and ions enable cell selective permeability. Lipids enable isolation from surrounding.
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