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12 Cards in this Set

  • Front
  • Back
selective permeability
a membrane allows some substances to pass more easily than others
main membrane material?
phospholipids form into a bilayer
have both hydrophobic and hydrophillic regions --> phospholipid
fluid mosaic model
a membrane with a fluid structure w/ proteins embedded or attached to a double layer of phospholipids
embedded proteins
can move and they have often have hydrophobic and hydrophillic regions
phospholipds move laterally very rapidly and often - it is very rare that they flip-flop
fluidity and temp
if temp. goes down too far, membrane get less solid which affects the function -- unsaturated phospholipids will remain more fluid at lower temp.
is wedged between phospholipids - at warmer temp. it restrains movement but at lower temp. keeps it
peripheral proteins
loosely bound to the surface of the embrane
integral proteins
penetrate the core of the bilayer, has a hydrophillic and hydrophobic (nonploar amino acids in alpha helices)
role of membrane proteins
reinforce shape of a cell and provide strong framework
membrane has distinct inside and outside - lipid compositionmay be difft. therefore, when the membrane is synthesized(vesicles) the outside of the er/golgi will be the inside of the membrane