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A-Level Biology OCR A

Bilayer Water Effect Non Polar Phospholipids Heads Intereact Explain

Front Explain the effect of changing solvent concentration on the permeability of cell membranes.
Back Effect of water:
  • Always must be some water present for bilayer to be maintained
  • Non-polar tails of phospholipids are oriented away from water, forming bilayer with hydrophobic core
  • Charged phosphate heads intereact with water helping to keep bilayer intact
  • When phospholipids cant intereact with water the bilayer can no longer exist bc polar heads are not attracted to non-polar substances

Effect of organic solvent:
  • As conc. increases around bilayer, its ability to interact with water decreases and bilayer starts to disperse

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