plasma membrane

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  • Created by: Angelique
  • Created on: 18-12-12 08:05

plasma membrane

  • controls how substances move in and out of a cell.
  • made of phospholipids, carbohydrates and protiens.
  • called a fluid mosaic structure cos the phospholipids for a flexible sheet, protiens float in the sheet and the carbs extend out from the protiens.
  • phospholipds are arranged in a bilayer. polar hydrophillic phosphate heads facing towards the water, non polar hydrophobic fatty acid tails facing each other in the middle.
  • protiens have hydrophillic amino acids in contact with water out of the membranes, hydrophobis amino acids in contact with the fatty chains inside the membrane.

transport protiens: take place through integral protiens, inculed f.d and a.c

receptor protiens: on the outside of p.m have a specific binding site.

recognition protiens: involved in cell recognition (glycoprotiens) 

strucural protiens: inside p.m attached to the cytoskeleton, involved in maintaning / changing the cells shape. on the outside of p.m used in cells adhesion.

  • the carbs are on the outer surface of the p.m, carbs with protiens attached to them are glycoprotiens, phospholipids joined to carbs are called glycolipids.
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