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Cell Membrane:

Cell Membrane:

  • Cell membrane is made up of a phospholipid bilayer.
  • The phosphate head of the phospholipid is a polar molecule and attracts water – it is hydrophilic.
  • The fatty acid tails are non-polar and hydrophobic.
  • In the cell membrane, the hydrophobic tails face inwards to avoid water, while the hydrophilic heads point outwards.
  • In the phospholipid bilayer are other molecules:
  • Proteins: some are fixed, while others move around. May be enzymes, carriers, or channels.
  • Cholesterol: reduces the fluidity of membrane by preventing movement of phospholipids.
  • Glycoproteins: (polysaccharide + protein) cell recognition and receptors
  • Glycolipids: (polysaccharide + lipid) cell recognition and receptors