For diffusion to occur, which condition must be met?
answer
A concentration gradient must exist.
question
Which adaptation is used by polar bears to maintain internal homeostasis in cold temperatures?
answer
blubber
question
Which best describes the difference between osmosis and diffusion?
answer
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.
question
What change would most improve the usefulness of the graph?
answer
Replace the concentration descriptions with actual values.
question
Which solution would most likely cause a plant placed in it to become firmer and more rigid?
answer
hypotonic
question
How does the contractile vacuole in a single-celled organism function to maintain homeostasis?
answer
It pumps water out of the cell.
question
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?
answer
by retaining water
question
Which reason best explains why the cell membrane helps the cell maintain homeostasis?
answer
The cell membrane is selectively permeable.
question
Which movement of particles would be most affected by a disorder that causes damage to carrier proteins?
answer
active transport
question
Which best describes dynamic equilibrium?
answer
Particles are moving into and out of the cell, but their concentrations remain stable.
question
Which motion of particles across a membrane requires energy?
answer
from low concentration to high concentration
question
Which homeostatic process moves particles against a concentration gradient?
answer
active transport
question
What would most likely happen to a unicellular organism if it was exposed to a hypotonic solution for an extended period of time?
answer
It would swell and then burst.
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