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14 Cards in this Set

  • Front
  • Back
_____ proteins extend into the lipid layer
integral
peripheral proteins associate with ____ lipids or ____ proteins
membrane lipids or peripheral proteins
peripheral proteins have 2 functions, what are they?
connect neighboring cells and account for the immunological properties of the cell.
what are the 3 basic structural elements of the cell membrane?
phospholipids
spingolipids
cholesterol
what are phoso/sphingolipids and cholesterol composed of?
polar head and non-polar tail
what is the basic structure of the cell membrane?
the bilayer
what is the role that cholestrol plays in the bilayer?
stabilizes and stiffens the membrane.
can ions pass through the lipid layer?
no only ions can
what is the cell membrane highly permeable to?
small molecules (neutral) and water
what is the cell membrane impermeable to?
ions and large molecules
why is there said spontaneous repair in the cell membrane?
because the amphiphatic molecules (phospholipids) are not chemically bound (phosphates) to each other. They are free to move around.
why is water accepted by the cell membrane so well?
because of its amphiphatic properties created by the distribution of H+ and O- ions.
what is selective permeability, what is it's function?
the cell membrane is selective to a particular substance to pass in/ out of the cell. The reason for this is to get waste out and keep valueable product in.
what is more permeable,. charged or neutral ions?
neutral ions