1
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
The input of ATP is required in order to facilitate
transportation.
C
Substances move from areas of low concentration to areas
of high concentration.
D
Membrane proteins are always needed in order for it to
take place.
2
Created by Boundless
Which of the following substances will NOT diffuse easily across the plasma
membrane?
A
Oxygen
B
Vitamin K
C
Sodium ions
D
Water
3
Created by Boundless
Which of the following factors does NOT affect the rate of diffusion across a
membrane?
A
the concentration gradient across the cell membrane
B
the temperature of a solution
C
the number of different types of particles in a solution
D
the size of the diffusing particles
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?
6
A
All of them are open at all times to allow passage of
materials.
B
They change shape as they move molecules across a
membrane.
C
all of these answers
D
Polar compounds pass through them to avoid nonpolar
regions.
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 low solute concentration.
B
Water will move to the area of high water concentration.
C
The solute will move to the area of low solute
concentration.
D
Water will move to the area of high solute concentration.
7
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
Hypotonic
B
Isotonic
C
Hypertonic
D
Equitonic
8
Created by Boundless
Which of the following is used as a method of osmoregulation in humans?
A
contractile vacuoles
B
plasmolysis
C
albumin
D
turgor pressure