Section 4: Cellular Transport
Pages 201-207
WATCH ALL THE CONCEPTS IN MOTION
Diffusion
1. Define diffusion.
a. Explain why diffusion happens.
2. Why is “dynamic equilibrium” dynamic?
3. What three factors affect the rate of diffusion? Explain how two of these work.
a. -
b. -
c. 4. How are diffusion and facilitated diffusion (note: I do not differentiate between channel proteins and
carrier proteins)
a. The same?
b. Different?
c. Why are both of these called passive diffusion?
Osmosis: Diffusion of Water
5. How are diffusion and osmosis
a. The same?
b. Different?
6. How do you distinguish a solute from a solvent? You will have to Google this.
7. You need to know what isotonic, hypertonic, and hypotonic solution do to plant and animal cells. Fill in
this chart:
Hypotonic
Meaning of the prefix
Where is the greatest concentration of
water [H2O]? Inside the cell? Outside the
cell, or neither (they are the same).
Which way will water move? Into the
cell, out of the cell, or equally in and
out?
What will happen (eventually) to an
animal cell?
Why?
Add a small sketch to your answer.
What will happen (eventually) to a plant
cell?
Why?
Add a small sketch to your answer.
NOTE: A “firm” plant cell is said to be
turgid.
What is the process that moves the
water?
Active Transport
8. How are facilitated diffusion and active transport
a. The same?
b. Different?
Islotonic
Hypertonic
9. Explain in words or pictures (or both) how the Na+/K+ pump works
10. One way sugar enters some cells is through a “coupled channel,” where it piggy-backs in with Na+.
Explain how this works using words and/or drawings. Be sure to explain why the Na+ is moving in in the
first place!
Look at the following links
http://www.youtube.com/watch?v=j5Qway4LAkk&feature=related
http://www.youtube.com/watch?v=JShwXBWGMyY
http://www.youtube.com/watch?v=Kd3LorZcJew&feature=related
http://www.youtube.com/watch?v=JShwXBWGMyY
For endo and exocytosis:
http://www.youtube.com/watch?v=K7yku3sa4Y8
Google or YouTube any of the following terms that you are still not confident with:
Diffusion
Facilitated diffusion
Osmosis
Aquaporins
Active Transport
Isotonic, hypotonic, and hypertonic
Solute and solvent
Na+ / K+ pump
How sugars enter cells
ATPase pump