Across
- 2. movement of molecules from high to low concentration
- 4. solution has a greater concentration of molecules
- 6. lets some things through; selectively _____
- 7. diffusion of water
- 8. transport that requires energy
- 11. tonicity when the concentrations are the same
- 12. type of diffusion that needs a protein channel
Down
- 1. when concentrations are equal
- 3. outer boundary of the cell
- 4. solution has a lesser concentration of molecules
- 5. a difference in concentrations
- 6. a major component of the cell membrane
- 9. channel ____; helps move materials across membrane
- 10. type of transport that does not require energy