This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: transport other molecules across the membrane. In the diagram below, energy from ATP is used to produce a concentration gradient of H + . Sucrose can be pumped into cells where the concentration of sucrose is already high by using the energy of a high concentration of hydrogen ions on the outside of a cell. Active transport pumps the hydrogen ions out and certain proteins in the cell membrane allow the hydrogen ions to reenter the cell. As the hydrogen ions force their way through this protein, the energy of reentry is used to pump sucrose into the cell....
View Full Document