Multiple Choice
Identify the choice that best completes the statement or answers the question.
|
|
1. |
As a result of diffusion, the concentration of many types of substances
a.
|
always remains greater inside a membrane. |
b.
|
eventually becomes balanced on both sides of a membrane. |
c.
|
always remains greater on the outside of a membrane. |
d.
|
becomes imbalanced on both sides of a membrane. |
|
|
2. |
Diffusion takes place
a.
|
only through a lipid bilayer membrane. |
b.
|
from an area of low concentration to an area of high concentration. |
c.
|
only in liquids. |
d.
|
from an area of high concentration to an area of low concentration. |
|
|
|
Concentration of Water and Solutes in Four Adjacent Cells
|
|
3. |
Refer to the illustration above. Which cell is most likely to lose both water molecules and solute molecules as the system approaches equilibrium?
a.
|
cell “A” |
c.
|
cell “C” |
b.
|
cell “B” |
d.
|
cell “D” |
|
|
4. |
Refer to the illustration above. In this system, solute molecules in cell “B” are most likely to
a.
|
remain in cell “B.” |
c.
|
diffuse into cell “A.” |
b.
|
adhere to cell “B’s” membrane. |
d.
|
diffuse into cell “D” |
|
|
5. |
Refer to the illustration above. In this system, water molecules are most likely to diffuse in which direction?
a.
|
from “A” to “B” |
c.
|
from “D” to “C” |
b.
|
from “B” to “D” |
d.
|
from “C” to “A” |
|
|
6. |
The dispersal of ink in a beaker of water is an example of
a.
|
diffusion. |
c.
|
active transport. |
b.
|
osmosis. |
d.
|
endocytosis. |
|
|
7. |
heavy rains : flooding ::
a.
|
osmosis : proton pumping |
b.
|
high solute concentration : isotonic solution |
c.
|
active transport : ATP |
d.
|
concentration difference : osmosis |
|
|
8. |
Sugar molecules can enter cells through the process of
a.
|
exocytosis. |
c.
|
osmosis. |
b.
|
facilitated diffusion. |
d.
|
ion pumps. |
|
|
9. |
Channels utilizing facilitated diffusion
a.
|
work in two directions. |
b.
|
require an electrical signal to function. |
c.
|
Both a and b |
d.
|
None of the above |
|
|
10. |
Which of the following is not characteristic of facilitated diffusion?
a.
|
It requires a carrier protein. |
b.
|
It moves substances against a concentration gradient. |
c.
|
It requires no energy input. |
d.
|
It involves a change in the shape of its carrier. |
|
|
11. |
Which of the following is true of ions and their transport across cell membranes?
a.
|
The “gates” for ion channels are always open. |
b.
|
Ions are very small and thus can cross cell membranes readily. |
c.
|
Electrical or chemical signals may control the movement of ions across cell membranes. |
d.
|
Because they are charged particles, the movement of ions across cell membranes requires energy input. |
|
|
12. |
Which of the following does not expend energy?
a.
|
diffusion |
c.
|
active transport |
b.
|
chemiosmosis |
d.
|
a sodium-potassium pump |
|
|
13. |
Which of the following enters a cell by active transport?
a.
|
glucose |
c.
|
sodium ion |
b.
|
water |
d.
|
potassium ion |
|
|
14. |
The process by which water passes into or out of a cell is called
a.
|
solubility. |
c.
|
selective transport. |
b.
|
osmosis. |
d.
|
endocytosis. |
|
|
|
|
|
15. |
Refer to the illustration above. The process shown is called
a.
|
osmosis. |
c.
|
active transport. |
b.
|
facilitated diffusion. |
d.
|
diffusion. |
|
|
16. |
The sodium-potassium pump usually pumps
a.
|
potassium out of the cell. |
b.
|
sodium into the cell. |
c.
|
potassium into the cell. |
d.
|
only a potassium and sugar molecule together. |
|
|
17. |
proton pump : protons ::
a.
|
ATP : protons |
c.
|
sodium-potassium pump : ATP |
b.
|
channel : protons |
d.
|
sodium-potassium pump : sodium |
|
|
18. |
Ridding the cell of material by discharging it from sacs at the cell surface is called
a.
|
chemiosmosis. |
c.
|
exocytosis. |
b.
|
exorcism. |
d.
|
endocytosis. |
|
|
19. |
Molecules that are too large to be moved across a cell membrane can be removed from the cell by
a.
|
diffusion. |
c.
|
lipid carriers. |
b.
|
exocytosis. |
d.
|
osmosis. |
|
|
20. |
Molecules that are too large to be moved through the membrane can be transported into the cell by
a.
|
osmosis. |
c.
|
lipid carriers. |
b.
|
endocytosis. |
d.
|
diffusion. |
|
|
21. |
endocytosis : exocytosis ::
a.
|
phagocytosis : bacteria |
c.
|
cold : hot |
b.
|
secrete : exocytosis |
d.
|
white blood cell : bacteria |
|