4.4 active transport

Question 1

definition of active transport

Answer 1

movement of molecules in/out of the cell from a low concentration region to a high concentration region using ATP and carrier proteins

Question 2

how is ATP used to move molecules?

Answer 2

ATP binds to protein & is hydrolysed to ADP + Pi

Question 3

how does active transport work? (5)

Answer 3

1- carrier protein that spans the plasma membrane binds to the molecule on 1 side
2- the molecule binds to the receptor site on the carrier protein
3- ATP binds to protein & splits into ADP & Pi -> protein molecule changes shape & opens to the opposite side of the membrane
4- molecules is released to the other side of the membrane
5- phosphate molecule is released from the protein which causes protein to revert into original shape & recombined with ADP to form ATP