AnswersMO-Biology AProkaryotic and Eukaryotic Cells

Cell Homeostasis Answers

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1
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Which statement describes the ability of the cell membrane to allow various substance to move through it?

A
The cell membrane is selectively permeable.
B
The cell membrane is composed of lipids and phosphates.
C
The cell membrane is both hydrophilic and hydrophobic.
D
The cell membrane is a bilayer structure.
2
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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

A
diffusion
B
osmosis
C
active transport
D
stable transport
3

What would most likely happen to a unicellular organism if it was exposed to a hypotonic solution for an extended period of time?

A
It would shrivel and shrink.
B
It would swell but never burst.
C
It would swell and then burst.
D
It would not be affected.
4

Which motion of particles across a membrane requires energy?

A
from high concentration to low concentration
B
from low concentration to high concentration
C
with no concentration gradient
D
through dynamic equilibrium
5

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?

Question illustration
A
Replace the concentration descriptions with actual values.
B
Plot contractions per second instead of contractions per minute.
C
Remove the plotted points and just keep the line.
D
Remove the name of the organism from the title.
6

Which adaptation helps polar bears maintain a constant internal temperature (thermal homeostasis) in cold weather?

A
three layers of fur
B
blubber
C
finding shade underground
D
white skin
7

For diffusion to occur, which condition must be met?

A
A concentration gradient must exist.
B
A hypotonic external environment must exist.
C
A hypertonic external environment must exist.
D
Dynamic equilibrium must exist.
8

Which best describes dynamic equilibrium?

A
There is a difference in concentration on either side of the cell membrane.
B
There is an uneven distribution of particles inside and outside the cell.
C
Particles are moving into and out of the cell, but their concentrations remain stable.
D
A concentration gradient is forcing water out of the cell and particles into the cell.
9

Which homeostatic process moves particles against a concentration gradient?

A
dynamic equilibrium
B
passive transport
C
osmosis
D
active transport
10

Which best describes the difference between osmosis and diffusion?

A
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.
B
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.
C
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.
D
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.

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