1. Transport Across Membranes
Practice Problems

2. What would happen to an animal cell if you put it in a solution with more salt on the outside than on the inside? Draw what it would look like.
Low [Salt]
High [H2O]
High [Salt]
Low [H2O]

3. What would happen to a plant cell if you placed it in a solution with more salt on the inside than the outside? Draw what it would look like.
High [Salt]
Low [H2O]
Low [Salt]
High [H2O]

4. What is happening here?
Assume the particles in the animation are SALT.
In what direction are the salt particles moving?
What is this process called?

5. In terms of osmosis, why does a slug shrivel up when you pour salt on it?

6. What would happen to an animal cell if you put it in a solution with more salt on the inside than on the outside? Draw what it would look like.
High [Salt]
Low [H2O]
Low [Salt]
High [H2O]

7. When you forget to water a plant what happens to it
When you forget to water a plant what happens to it? What has happened to each of its cells?

8. Explain why saltwater organisms cannot survive in Salem Lake (fresh water).
DAM…

9. What is happening here?
Assume the particles in the picture are large sugars.
In what direction are the sugars moving?
What is this process called?

10. What would happen to a plant cell if you placed it in a solution with more salt on the outside than the inside? Draw what it would look like.
Low [Salt]
High [H2O]
High [Salt]
Low [H2O]

11. Why does a high salt diet make people retain water in their bodies?

12. Why did people use salt to preserve meat before we had refrigeration?

13. A freshwater protozoan is placed in salt water
A freshwater protozoan is placed in salt water. What will happen to the protozoan?
Low [Salt]
High [H2O]
High [Salt]
Low [H2O]

14. Nerve cells transmit signals by moving sodium and potassium across their membranes from low to high concentrations. A nerve cell with no mitochondria would not be able to transmit signals. Why not?

15. Scientists believe that mitochondria evolved as prokaryotes that were engulfed by a eukaryotic cell. What is the name of the process where a cell “eats” an outside object without it passing through the membrane?
Prokaryotic Cell
Eukaryotic Cell