Cell Homeostasis Answers

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1
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Which solution would most likely cause a plant placed in it to become firmer and more rigid?

A
hypertonic
B
hypotonic
C
isotonic
D
osmotic
2
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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?

A
by retaining water
B
by conserving energy
C
by reducing body temperature
D
by maintaining heart rate
3

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
4

How does the contractile vacuole in a single-celled organism function to maintain homeostasis?

A
It pumps water into the cell.
B
It pumps water out of the cell.
C
It pumps solutes into the cell.
D
It pumps solutes out of the cell.
5

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.
6

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.
7

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
8

Which homeostatic process requires energy to move particles across the plasma membrane?

A
active transport
B
passive transport
C
dynamic equilibrium
D
osmosis
9

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
10

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?

A
hypertonic transport
B
active transport
C
passive transport
D
dynamic equilibrium

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