3. Requires energy to move substances across the membrane. -Small & large particles

5. The energy used by cells.

7. The movement of small particles from high to low concentration. Does NOT use energy.

9. A protein that serves as a passage way through the membrane in active transport.

11. The diffusion of water.

13. The movement of particles across a membrane withOUT using energy. -Small particles

15. Bringing large particles into the cell using a vesicle.

17. A packet of membrane that carries large particles into and out of a cell.

19. Bringing large particles out of the cell.