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- 1. Multiple Choice
The diagram illustrates the movement of molecules through a cell membrane.
What process is being used by the cell to move the molecules?
osmosis
endocytosis
active transport
facilitated diffusion
- 2. Multiple Choice
Which cellular structure in an animal cell helps maintain homeostasis by controlling the transportation of substances into and out of the cell?
vacuole
cell membrane
mitochondrion
cell wall
- 3. Multiple Choice
A student used a microscope to observe Elodea submerged in a solution. The student observed the cell cytoplasm pull away from the cell wall and clump together in the center of the cell.
What statement best explains why this occurred?
The cell was submerged in a pure water solution
The cell was submerged in a solution with a higher water concentration than the inside of the cell.
The cell was submerged in a solution with an equal water concentration to the inside of the cell.
The cell was submerged in a solution with a lower water concentration than the inside of the cell.
- 4. Multiple Choice
Which process moves an ion across a cell membrane against the concentration gradient?
diffusion
exocytosis
facilitated diffusion
active transport
- 5. Multiple Choice
Which of these would be a model of diffusion?
A student passes through a revolving door.
Two students pass by each other in a hallway.
Many students pass from a crowded room into an empty hallway.
Two students bump into each other in a crowded school bus.
- 6. Multiple Choice
Shira is analyzing samples of red blood cells using a microscope. Her observations are shown.
Shira observes that the shape of cell A appears normal, while Cell B appears swollen and Cell C is shrunken. The shrinking of Cell C indicates that the cell is reacting to what?
lower solute concentration outside the cell than inside
an anaerobic environment outside the cell
higher solute concentration outside the cell than inside
more oxygen inside the cell than what can be used
- 7. Multiple Choice
The process of osmosis would explain the overall movement of water INTO a cell if the percentage of
water was 90% inside the cell and 95% outside the cell.
protein was 30% inside the cell and 35% outside the cell.
water was 95% inside the cell and 90% outside the cell.
water and protein was equal inside and outside the cell.
- 8. Multiple Choice
What should happen if there is no difference in concentration of a solute on either side of a semipermeable membrane?
The system is in equilibrium with no net change in water movement across the membrane.
There is a concentration gradient between the membranes.
Membrane proteins can no longer function.
All atoms and molecules stop moving.
- 9. Multiple Choice
The diagram illustrates the use of energy by a nerve cell to expel a sodium ion from inside the cell.
Which best explains why energy is necessary to complete this function?
The ion is being transported against a concentration gradient.
The ion has more kinetic energy than surrounding molecules.
The ion is a waste product that is digested by the cell membrane.
The ion is too large to pass through the cell membrane by diffusion.
- 10. Multiple Choice
A biologist diluted a blood sample with distilled water. While observing the sample under a microscope, she noted that the red blood cells burst. This bursting is most likely the result of which process?
active transport
staining
ingestion
osmosis
- 11. Multiple Choice
Which molecule will most likely diffuse through a cell membrane?
starch
O2
protein
DNA
- 12. Multiple Choice
Look at the image above. Which process is involved in the movement of gases between an animal's lungs and bloodstream?
diffusion
osmosis
endocytosis
exocytosis
- 13. Multiple Choice
In cells, transport of nutrients and waste across membranes is accomplished through the process of facilitated diffusion. In which of the following ways does facilitated diffusion differ from simple diffusion?
Facilitated diffusion requires that a protein channel be present before crossing the membrane.
Simple diffusion requires that a protein channel be present before crossing the membrane.
Facilitated diffusion requires that nutrients or wastes travel from a higher concentration to a lower concentration.
Simple diffusion requires that nutrients or wastes travel from a higher concentration to a lower concentration.
- 14. Multiple Choice
Active transport and facilitated diffusion in cells both result in the movement of nutrients or wastes across a membrane. Which of the following comparisons between active transport and facilitated diffusion is not true?
Facilitated diffusion requires proteins and active transport does not.
Active transport requires the input of energy and facilitated diffusion does not.
Facilitated diffusion requires a concentration gradient across the membrane and active transport does not.
Active transport requires the presence of a semipermeable membrane and facilitated diffusion does not.
- 15. Multiple Choice
Review the chart above. Under which condition will the cell experience the greatest flow of water into the cell from the environment?
Condition 1
Condition 2
Condition 3
Condition 4
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