biological membranes- fluid and the fluid mosaic module

nature of phospholids
1. head is hydrophillic (attracts water) either side of membrane.
2. tails are hyrdophobic
layers and bilayers
1. if phospholids are surrounded by water they form a phospholid bilayer
  1. molecules can move freely in this state
2. heads cant move through hydrophobic region= stability
3. cant perform all function examples
  1. plasma membrane in growing shoot= receptors that allow them to detect molecules to regulate growth
  2. muscle cell membrane= contain a number of channels for quick uptake in glucose to provide energy for muscle contraction
fluid mosaic module
1. feature; bilayer of phospholid molecules, protein molecules and extrinsic molecules
2. phosphlid molecuw with a carbohydrate attached= glycolipid
3. protein molecule with a carbohydrate attached= glycoprotein
4. give stability. bind hydrophobic tails together in order to fit more in= cholesterol
5. allows the movement of too large to pass through the phospholid bilayer= carrier proteins. endocytosis= mass movement of substances through membrane
6. capable of carrying a specific molecule through membrane= channel proteins. for polar substances
membranes and temperature
1. increasing temperature= more kinetic energy molecules move faster
  1. movement makes membranes leaky- lets molecules in and out easily

Resource summary

	Created by Jacqueline Debor over 10 years ago