Free Flashcard From Biology Test 3
Consider the transport of protons and sucrose into a
plant cell by the sucrose-proton cotransport protein. Plant cells
continuously produce a proton gradient by using the energy of ATP
hydrolysis to pump protons out of the cell. Why, in the absence of
sucrose, don't protons move back into the cell through the
sucrose-proton cotransport protein?
The movement of protons through the cotransport protein cannot occur unless sucrose also moves at the same time.