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A-Level Biology OCR A

Protein Carrier Molecule Cell Inside Phosphate Active Specific

Front Explain in a paragraph and diagram how substances can move across a membrane by active transport.
Back Active transport:
  • Specific molecule or ion to be transported binds to receptors in the channel of the specific carrier protein on the outside of the cell
  • On the inside of the cell ATP binds to the carrier protein and is hydrolysed into ADP and phosphate
  • Binding of phosphate molecule to carrier protein causes protein to change shape - opens up inside of the cell
  • Molecule or ion is released inside of the cell
  • Phosphate molecule is released from the carrier protein and recombines with ADP to form ATP
  • Carrier protein returns to its normal shape

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