1
Created by Boundless
Which of the following factors does NOT affect the rate of diffusion across a
membrane?
A
the temperature of a solution
B
the size of the diffusing particles
C
the concentration gradient across the cell membrane
D
the number of different types of particles in a solution
2
Created by Boundless
In a beaker separated by a membrane permeable only to water, one area has a
high solute concentration and the other has a low solute concentration. What do
you expect will happen in the beaker?
A
Water will move to the area of high water concentration.
B
Water will move to the area of high solute concentration.
C
The solute will move to the area of low solute
concentration.
D
Water will move to the area of low solute concentration.
3
Created by Boundless
You take a sample of blood cells and place them in a solution. Fifteen minutes
later, you observe that they appear shriveled. What is the tonicity of the solution
they were placed in?
A
Hypertonic
B
Isotonic
C
Equitonic
D
Hypotonic
4
Created by Boundless
Which of the following characteristics distinguishes facilitated transport from
simple diffusion? Passive transport ______________.
A
uses membrane proteins and channels to move molecules
down concentration gradients.
B
describes the movement of biomolecules such as proteins,
carbohydrates, and fatty acids.
C
explains the movement of molecules or ions from high to
low concentration.
D
requires the input of cellular energy to transport
biomolecules.
5
Created by Boundless
Which of the following statements about channel proteins is true?
A
Polar compounds pass through them to avoid nonpolar
regions.
B
all of these answers
C
They change shape as they move molecules across a
membrane.
D
All of them are open at all times to allow passage of
materials.
6
Created by Boundless
Which of the following statements about passive transport is true?
A
Substances move from areas of high concentration to
areas of low concentration.
B
Membrane proteins are always needed in order for it to
take place.
C
The input of ATP is required in order to facilitate
transportation.
D
Substances move from areas of low concentration to areas
of high concentration.
7
Created by Boundless
Which of the following describes the mechanism of the sodium-potassium pump?
A
Sodium and potassium ions bind to the enzyme at the
same time, and then sodium is released.
B
After ATP is hydrolyzed, the phosphate group attaches to
the enzyme before the sodium ions.
C
Potassium cannot attach to the enzyme until the sodium
ions detach from the enzyme.
D
The process begins when potassium attaches to the
enzyme, which then hydrolyzes ATP.
8
Created by Boundless
How does active transport move substances against the electrochemical gradient?
A
all of these answers
B
ATP causes red blood cells to break down membranes.
C
Sodium and potassium help push substances across
membranes.
D
With the help of ATP, pumps move substances across
membranes
9
Created by Boundless
Which of the following applies to secondary active transport and not primary active
transport?
A
It does not directly require energy from ATP.
B
It always involves moving a molecule into the cell.
C
It utilizes only antiporter proteins.
D
It only involves moving a molecule up its concentration
gradient.
10
Created by Boundless
What is the difference between phagocytosis and pinocytosis?
A
Phagocytosis takes in cations, while pinocytosis takes in
anions
B
Phagocytosis takes in carbohydrates, while pinocytosis
takes in lipids.
C
Phagocytosis takes in caveolin, while pinocytosis takes in
clathrin.
D
Phagocytosis takes in large food particles, while
pinocytosis takes in liquid particles.