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A-Level Biology OCR A

Particles Pass Facilitated Membrane Area Concentration Proteins Carrier

Front Explain in paragraph and with diagram how substances can move across a membane by facilitated diffusion.
Back Facilitated diffusion
  • Particles on both sides of membrane are moving constantly in random directions
  • Over time there will be a net movement of the particles from an area of high concentration to an area of low concentration
  • Particles can pass through channel proteins embedded in the membrane

  • Particles can also pass through using carrier proteins - specific molecule binds to a carrier protein (complementary fit) which causes a change in shape of the protein allowing the molecule to pass thru

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