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- 1. Multiple Choice
Which homeostatic process requires energy to move particles across the plasma membrane?
active transport
passive transport
dynamic equilibrium
osmosis
- 2. Multiple Choice
Which homeostatic process moves particles against a concentration gradient?
dynamic equilibrium
passive transport
osmosis
active transport
- 3. Multiple Choice
Which statement describes the ability of the cell membrane to allow various substance to move through it?
The cell membrane is selectively permeable.
The cell membrane is composed of lipids and phosphates.
The cell membrane is both hydrophilic and hydrophobic.
The cell membrane is a bilayer structure.
- 4. Multiple Choice
Which best describes dynamic equilibrium?
There is a difference in concentration on either side of the cell membrane.
There is an uneven distribution of particles inside and outside the cell.
Particles are moving into and out of the cell, but their concentrations remain stable.
A concentration gradient is forcing water out of the cell and particles into the cell.
- 5. Multiple Choice
In which kind of solution is the concentration of solutes the same inside and outside of the cell?
isotonic
hypertonic
hypotonic
concentrated
- 6. Multiple Choice
Which process is characterized by the movement of particles from an area of high concentration to an area of low concentration across the plasma membrane without the use of energy?
hypertonic transport
active transport
passive transport
dynamic equilibrium
- 7. Multiple Choice
For diffusion to occur, which condition must be met?
A concentration gradient must exist.
A hypotonic external environment must exist.
A hypertonic external environment must exist.
Dynamic equilibrium must exist.
- 8. Multiple Choice
Which movement of particles would be most affected by a disorder that causes damage to carrier proteins?
osmosis
passive transport
active transport
diffusion
- 9. Multiple Choice
Which motion of particles across a membrane requires energy?
from high concentration to low concentration
from low concentration to high concentration
with no concentration gradient
through dynamic equilibrium
- 10. Multiple Choice
Which best describes the difference between osmosis and diffusion?
Osmosis is the movement of particles from a high to a low particle concentration, while diffusion is the movement of water from a high to a low water concentration.
Diffusion is the movement of particles from a high to low particle concentration, while osmosis is the movement of water from a high to a low water concentration.
Diffusion is the movement of particles from a low to a high particle concentration, while osmosis is the movement of water from a low to a high water concentration.
Osmosis is the movement of particles from a low to a high particle concentration, while diffusion is the movement of water from a low to a high water concentration.
- 11. Multiple Choice
Which adaptation helps polar bears maintain a constant internal temperature (thermal homeostasis) in cold weather?
three layers of fur
blubber
finding shade underground
white skin
- 12. Multiple Choice
What would most likely happen to a unicellular organism if it was exposed to a hypotonic solution for an extended period of time?
It would shrivel and shrink.
It would swell but never burst.
It would swell and then burst.
It would not be affected.
- 13. Multiple Choice
Reptiles and birds excrete waste as an insoluble white solid that is called uric acid. How does this help them to maintain internal homeostasis in hot climates?
by retaining water
by conserving energy
by reducing body temperature
by maintaining heart rate
- 14. Multiple Choice
How does the contractile vacuole in a single-celled organism function to maintain homeostasis?
It pumps water into the cell.
It pumps water out of the cell.
It pumps solutes into the cell.
It pumps solutes out of the cell.
- 15. Multiple Choice
Which solution would most likely cause a plant placed in it to become firmer and more rigid?
hypertonic
hypotonic
isotonic
osmotic
- 16. Multiple Choice
The data in the graph are the result of a paramecium being placed in a hypertonic salt solution.
What change would most improve the usefulness of the graph?
Replace the concentration descriptions with actual values.
Plot contractions per second instead of contractions per minute.
Remove the plotted points and just keep the line.
Remove the name of the organism from the title.
- 17. Multiple Choice
Water makes up a large percentage of the body’s cells. For a cell to remain in homeostasis, there must be a mechanism to control water changes in the cells. The movement of water from an area of high water concentration to an area of low water concentration is ___________.
diffusion
osmosis
active transport
stable transport
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