Cell Transport Vocab
The movement of any substance across a cell membrane using energy from ATP. The ATP is provided by the cell.
active transport
A protein that functions in the transport of molecules across a membrane. The proteins are embedded in the cell membrane. They bond with the molecule to be carried, transport it to the opposite side of the membrane, and release it.
carrier molecules
The difference in concentration of a substance across a space. This usually starts with a high concentration and flows into a low concentration.
concentration gradient