biological membranes- fluid and the fluid mosaic module

biological membranes- fluid and the fluid mosaic module

1. nature of phospholids

   • head is hydrophillic (attracts water) either side of membrane.
   • tails are hyrdophobic

2. layers and bilayers

   • if phospholids are surrounded by water they form a phospholid bilayer
     • molecules can move freely in this state
   • heads cant move through hydrophobic region= stability
   • cant perform all function examples
     • plasma membrane in growing shoot= receptors that allow them to detect molecules to regulate growth
     • muscle cell membrane= contain a number of channels for quick uptake in glucose to provide energy for muscle contraction

3. fluid mosaic module

   • feature; bilayer of phospholid molecules, protein molecules and extrinsic molecules
   • phosphlid molecuw with a carbohydrate attached= glycolipid
   • protein molecule with a carbohydrate attached= glycoprotein
   • give stability. bind hydrophobic tails together in order to fit more in= cholesterol
   • allows the movement of too large to pass through the phospholid bilayer= carrier proteins. endocytosis= mass movement of substances through membrane
   • capable of carrying a specific molecule through membrane= channel proteins. for polar substances

4. membranes and temperature

   • increasing temperature= more kinetic energy molecules move faster
     • movement makes membranes leaky- lets molecules in and out easily

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