AnswersFall 24 GSE Biology A ICCell Homeostasis

Lesson 3: Cell Homeostasis Answers

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T
There is a difference in concentration on either side of the cell membrane.
T
There is an uneven distribution of particles inside and outside the cell.
P
Particles are moving into and out of the cell, but their concentrations remain stable.
A
A concentration gradient is forcing water out of the cell and particles into the cell.
2
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How does the contractile vacuole in a single-celled organism function to maintain homeostasis?

I
It pumps water into the cell.
I
It pumps water out of the cell.
I
It pumps solutes into the cell.
I
It pumps solutes out of the cell.
3

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

t
three layers of fur
b
blubber
f
finding shade underground
w
white skin
4

Which homeostatic process moves particles against a concentration gradient?

d
dynamic equilibrium
p
passive transport
o
osmosis
a
active transport
5

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?

b
by retaining water
b
by conserving energy
b
by reducing body temperature
b
by maintaining heart rate
6

most

h
hypertonic
h
hypotonic
i
isotonic
o
osmotic
7

most

Question illustration
R
Replace the concentration descriptions with actual values.
P
Plot contractions per second instead of contractions per minute.
R
Remove the plotted points and just keep the line.
R
Remove the name of the organism from the title.
8

most

I
It would shrivel and shrink.
I
It would swell but never burst.
I
It would swell and then burst.
I
It would not be affected.
9

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.
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.
11

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.
12

In which kind of solution is the concentration of solutes the same inside and outside of the cell?

A
isotonic
B
hypertonic
C
hypotonic
D
concentrated
13

Which movement of particles would be most affected by a disorder that causes damage to carrier proteins?

A
osmosis
B
passive transport
C
active transport
D
diffusion

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