|
True/False
Indicate whether the sentence or statement is true or false.
|
|
1. |
Diffusion is an active process that requires a cell to expend a great deal of energy.
|
|
2. |
During diffusion, molecules diffuse from a region where their concentration is low to a region where their concentration is higher until they are evenly dispersed.
|
|
3. |
A cell placed in a strong salt solution would probably burst because of an increase in osmotic pressure.
|
|
4. |
When the concentration of solutes outside the cell is equal to the concentration of solutes inside the cell, the cell solution is isotonic relative to its environment.
|
|
5. |
Diffusion occurs only in living systems.
|
|
6. |
The transport of specific particles through a membrane by carrier proteins is known as facilitated diffusion.
|
|
7. |
Ion channels are usually able to transport only one type of ion.
|
|
8. |
Facilitated diffusion moves molecules and ions in one direction only, while active transport moves them in two directions.
|
|
9. |
In active transport, energy is required to move a substance across a cell membrane.
|
|
10. |
Both the sodium-potassium pump and the proton pump require energy to move particles across the cell membrane.
|
|
11. |
The sodium-potassium pump moves sodium and potassium ions against the concentration gradient.
|
|
12. |
Exocytosis helps the cell rid itself of wastes.
|
|
13. |
During the process of exocytosis, the cell membrane extends to engulf substances that are too big to pass through the cell membrane.
|
|
Completion
Complete each sentence or statement.
|
|
14. |
Active transport systems are a form of cell transport that requires energy from molecules of ____________________.
|
|
15. |
____________________ allows a cell to stockpile substances in far greater concentrations than they occur outside the cell.
|
|
16. |
The transport of food into cells involves the action of the sodium-potassium pump and ____________________ channels.
|
|
|
A B
|
|
17. |
Refer to the illustration above. The process shown in figure “B” is called ____________________.
|
|
18. |
Refer to the illustration above. Cells often trap extracellular particles and fluid. This is shown in figure ____________________.
|
|
19. |
The process in which an amoeba engulfs its prey and takes it in is known as ____________________.
|
