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A-Level Biology OCR A

Particles Pass Facilitated Membrane Area Concentration Proteins Carrier

Facilitated diffusion utilizes channel or carrier proteins to transport substances across a membrane down their concentration gradient, involving specific molecule binding and protein conformational changes.

Facilitated diffusion moves substances across a membrane down their concentration gradient using channel or carrier proteins, which bind to specific molecules and facilitate their passage.

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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