Transport Mechanisms in Cells

(a)   is the movement of materials across the cell membrane without using cellular energy.

2. (a)   is the process by which particles move from an area of high concentration to an area of lower concentration.

3. (a)   is the process by which molecules that cannot directly diffuse across the membrane pass through special protein channels.

4. (a)   is the facilitated diffusion of water through a selectively permeable membrane.

5. (a)   are water channel proteins that allow water to pass through cell membranes.

6. Two adjacent solutions are (a)   if they have the same concentrations of solute.

7. (a)   solutions have a higher concentration of solute compared to another solution.

8. (a)   solutions have a lower concentration of solute compared to another solution.

10. (a)   is the movement of materials against a concentration difference which requires energy.

Which term refers to the condition that exists when no net change in concentration results from diffusion?

• concentration

• equilibrium

• osmosis

• randomness