Direct active transport

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  • Created by: Eema003
  • Created on: 24-02-16 11:32

Direct Active Transport

  • The carrier proteins span the plasma membrane and bind to the molecule or ion being transported.
  • The molecule binds to the receptor sites on the carrier protein.
  • The ATP binds to the protein causing it to split into ADP and a phosphate molecule. This causes the protein to change shape and it opens at the other end to let the molecule out.
  • The molecule is now released on to the other side of the membrane.
  • The phosphate molecule is also released and the protein reverts back to it's original shape and the phosphate molecule recombines with the ADP to form ATP.
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Active transport needs ATP because it goes against a concentrated gradient. 

Facilitated diffusion occurs down a concetrated gradient and so does not need metabolic energy to help it do so.

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