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Cell Transport Test
Multiple Choice: Identify the choice that best completes the statement or answers the question.
1. Many marine organisms have body surfaces that are permeable to water but not to salt. Osmosis can change the
pressure of their body fluids. Fortunately, the ocean is very stable in its salt content. What would happen if a jellyfish
were placed in a very low‐salt environment? (Hint: Draw out scenario)
A. It would gain water from the environment.
B. It would gain nutrients from the water in the environment.
C. It would lose proteins into the water.
D. It would lose salt into the water.
2. A single‐celled organism has star‐shaped organelles called contractile vacuoles that move water from the inside of
the cell to the outside of the cell.
The data presented in the table above were obtained in an experiment in which the organism was placed in water
with different salt concentrations. The rate at which the contractile vacuole contracted to pump out excess water
was recorded.
How could you explain the relationship between the rate of contractile vacuole contractions and the salt
concentration?
A. When the salt concentration outside the cell is very high, the contractile vacuole has to contract more
rapidly.
B. When the salt concentration outside the cell is very low, it has no impact on the contractile vacuole
contractions.
C. When the salt concentration outside the cell is very high, the contractile vacuole does not need to contract
as rapidly.
D. When the salt concentration outside the cell is very low, the contractile vacuole does not need to contract
as rapidly.
3. Vegetables in the produce section of the grocery store are automatically sprayed periodically with water. Which
answer choice below best explains why this keeps the vegetables crisp?
A. Water leaves the vegetable cells by diffusion.
B. Water enters the cells of the vegetables by osmosis.
C. Osmosis caused salts to enter the vegetable cells.
D. Salts in the vegetables caused water to leave the cells.
4. Eukaryotic cells import (bring in) large molecules through the process of _______________ and secrete (remove)
larger molecules by ______________.
A. endocytosis; exocytosis
C. exocytosis ; endocytosis
B. diffusion; exocytosis
D. endocytosis ; phagocytosis
5. A patient goes to a hospital because they are feeling very ill. The doctor hooks that patient up to an IV of pure water.
Explain the movement of the water in relation to the patient’s blood cells. (Draw out the scenario.)
A. More water will move into the blood cells.
C. Water will move both into and out of the
B. More water will move out of the blood
cell in equal amounts.
cells.
D. Water would not be moving.
6. The structure below regulates the substances that can enter and leave a cell. Which characteristic of this structure is
responsible this?
A.
B.
C.
D.
Selective permeability
Active Transport
Diffusion
Osmosis
7. If cells with 0% solute are placed in a strong sugar solution, what will happen? (Draw out the scenario.)
A. water will pass from the sugar solution to the cells
B. water will pass from the cells to the sugar solution
C. water will stay in the cell
D. sugar will move into the cells
8. Both facilitated diffusion and the sodium-potassium pump involve –
A. ATP
B. Movement against a concentration gradient.
C. The use of proteins.
D. Movement with the concentration gradient.
9. What cell process is responsible for the effect shown in the figure below?
A. Active transport
B. Endocytosis
C. Facilitated diffusion
D. Osmosis
10. Which of the following statements best describes the "fluid mosaic model" of the structure of the cell membrane
below?
A. two layers of carbohydrates with proteins between the lipid layers
B. two layers of proteins with lipid layers between the protein layers
C. A single layer of protein on the outside and a single layer of lipids on the inside
D. a double layer of lipid molecules with protein molecules between the layers
11. If someone sitting at the other end of a restaurant smokes a cigarette, you may still breathe in some of the smoke.
The movement of smoke through the air of the restaurant is an example of what type of transport?
A. osmosis
C. facilitated diffusion
B. simple diffusion
D. exocytosis
12. The diagram below shows the movement of potassium ions into a cell. Which description best describes the
movement of potassium ions in the picture below?
A. requires no energy usage by the cell, moves against the
concentration gradient
B. Requires energy from the cell, moves with the
concentration gradient
C. Requires no energy usage by the cell, moves with the
concentration gradient
D. Requires energy from the cell, moves against the
concentration gradient.
13. What process is demonstrated in the figure to the right?
A. osmosis
B. endocytosis
C. facilitated diffusion
D. exocytosis
14. The total solute concentration of a red blood cell is about 2%. Sucrose cannot pass through a red blood cell's plasma
membrane, but water and urea can. Osmosis will cause the cell to shrink the most when the cell is immersed in
which of the following solutions? (Draw out the scenario.)
A. a hypertonic solution
C. an isotonic solution
B. hypotonic solution
D. the cell will never shrink
15. What is the difference between active transport and passive transport?
A. active transport and passive transport are the exact same
B. active transport moves material from a high concentration to low concentration, while passive moves material
from a low concentration to a high concentration
C. active transport requires energy, while passive transport does not require energy
D. active transport does not require energy while passive transport does require energy.