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Cell Homeostasis
Test Description: Explaining how a cell maintains hemeostasis
Instructions: Answer all questions to get your test result.
1) Which homeostatic process moves particles against a concentration gradient?
A
active transport
B
passive transport
C
dynamic equilibrium
D
osmosis
2) Which reason best explains why the cell membrane helps the cell maintain homeostasis?
A
The cell membrane is a bilayer structure.
B
The cell membrane is both hydrophilic and hydrophobic.
C
The cell membrane is selectively permeable.
D
The cell membrane is composed of lipids and phosphates.
3) Which term refers to a solution with more molecules outside the cell than inside the cell?
A
hypertonic
B
isotonic
C
hypotonic
D
equitonic
4) Which homeostatic process is characterized by the diffusion of water molecules?
A
active transport
B
osmosis
C
dynamic equilibrium
D
passive transport
5) For diffusion to occur, which condition must be met?
A
A concentration gradient must exist.
B
Dynamic equilibrium must exist.
C
A hypotonic external environment is required.
D
A hypertonic external environment is required.
6) Which motion of particles across a membrane requires energy?
A
through dynamic equilibrium
B
from high concentration to low concentration
C
with no concentration gradient
D
from low concentration to high concentration
7) How does the contractile vacuole in a single-celled organism function to maintain homeostasis?
A
It pumps water out of the cell.
B
It pumps solutes into the cell.
C
It pumps solutes out of the cell.
D
It pumps water into the cell.
8) Which solution would most likely cause a plant placed in it to become firmer and more rigid?
A
It pumps solutes out of the cell.
B
It pumps water out of the cell.
C
It pumps water into the cell.
D
It pumps solutes into the cell.
9) Which best describes dynamic equilibrium?
A
A concentration gradient is forcing water out of the cell and particles into the cell.
B
There is a difference in concentration on either side of the cell membrane.
C
Particles are moving into and out of the cell, but their concentrations remain stable.
D
There is an uneven distribution of particles inside and outside the cell.
10) Which movement of particles would be most affected by a disorder that causes damage to carrier proteins?
A
diffusion
B
isotonic
C
active transport
D
osmosis
*select an answer for all questions
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