Apedia

A-Level Biology OCR A

Protein Carrier Molecule Cell Inside Phosphate Active Specific

Active transport involves carrier proteins binding substances, using ATP hydrolysis for energy to change shape, and releasing the substances on the opposite side of the membrane, moving them against their concentration gradient.

Active transport moves substances against their concentration gradient using carrier proteins that bind the substance, hydrolyze ATP for energy, change shape, and release the substance on the other side.

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

Learn with these flashcards. Click next, previous, or up to navigate to more flashcards for this subject.

Next card: Cell phagosome contents explain paragraph diagram substances move

Previous card: Facilitated particles proteins state types molecule move membrane

Up to card list: A-Level Biology OCR A