Chapter 6 - Cell Membranes - 6.5 - Large Molecules Enter and Leave a Cell through Vesicles - 6.5 Recap - Learning Outcomes - Page 128: 3

1) Primary active transport hydrolyzes ATP to supply the energy to pump a molecule or ion against its concentration gradient. 2) Secondary active transport systems use preexisting molecular gradients to drive import of other molecules, indirectly using ATP to drive the exchange. A symporter protein pairs the movement of a solute across the membrane against the concentration gradient.

1) Primary active transport hydrolyzes ATP to supply the energy to pump a molecule or ion against its concentration gradient. 2) Secondary active transport systems use preexisting molecular gradients to drive import of other molecules, indirectly using ATP to drive the exchange. A symporter protein pairs the movement of a solute across the membrane against the concentration gradient.