A. active transport b. facilitated diffusion c. diffusion d. osmosis e. exocytosis

1. the movement of molecules from an area of high concentration to an area of low concentration.
2. the diffusion of water molecules.
3. energy is used to move molecules from an area of low concentration to an area of high concentration.
4. membrane proteins are used to move molecules across the membrane but no energy is required.
5. the movement of molecules down their concentration gradient.
6. the movement of molecules up/against their concentration gradient.
7. membrane proteins are used to move molecules across the membrane but energy from atp is required.
8. a type of active transport that involves vesicles moving molecules out of a cell.