Question 1

These molecules move through the lipid portion of the plasma membrane by simple diffusion.

Accepted Answer

A)   CO2 and O2
B)   glucose
C)   Na+ and Cl-
D)   K+ and Ca2+E) None of the above
F) All of the above

Question 2

The force that causes water and solutes to cross cell membranes by filtration is _ .

Accepted Answer

A)   a concentration gradient
B)   energy provided by ATP
C)   hydrostatic pressure
D)   kinetic energy of moleculesE) A) and C)
F) B) and C)

Question 3

A dialysis sac that is permeable to glucose and water is filled with water and placed in a beaker containing 20% glucose solution. Will there be a net transport of water across the dialysis sac? If so, in which direction will the water move, into the sac or out of the sac?

Accepted Answer

A)   There is no net movement, but water will move back and forth across the membrane.
B)   No, there is no force to drive the water across the membrane.
C)   Yes, water will move into the sac.
D)   Yes, water will move out of the sac.E) B) and D)
F) B) and C)

Question 4

Which of the following statements is true?

Accepted Answer

A)   Active processes move molecules along a concentration gradient.
B)   Passive processes move molecules against a concentration gradient.
C)   Passive processes require ATP.
D)   Active processes require ATP.E) A) and B)
F) A) and C)

Question 5

Filtration is a non-selective, passive process in which water and solutes are forced through a membrane by hydrostatic pressure. The following property limits movement of some solutes.

Accepted Answer

A)   hydrophilic or hydrophobic nature of solutes
B)   temperature of the fluid
C)   tonicity of the solution being filtered
D)   size of the membrane poresE) A) and C)
F) All of the above

Question 6

Active processes .

Accepted Answer

A)   include osmosis
B)   move substances against (up)  a concentration and/or electrical gradient
C)   require a hydrostatic pressure gradient
D)   move fats and respiratory gases through cell membranesE) A) and B)
F) A) and C)

Question 7

A membrane transport process is active if it requires .

Accepted Answer

A)   energy provided by ATP
B)   a concentration gradient
C)   a pressure difference
D)   kinetic energy of moleculesE) B) and C)
F) B) and D)

Question 8

Molecule A has a molecular weight of 175 and Molecule B has a molecular weight of 450. A 0.1 M solution of each is placed on agar gel. Which molecule will diffuse more rapidly through the agar?

Accepted Answer

A)   molecule A
B)   molecule B
C)   They will move at the same rate.D) A) and B)
E) All of the above

Question 9

A(n)  in molecular size and a(n)  in temperature result in an increased rate of diffusion.

Accepted Answer

A)   decrease, decrease
B)   decrease, increase
C)   increase, decrease
D)   increase, increaseE) A) and B)
F) B) and C)

Question 10

In comparing simple diffusion to facilitated diffusion, you note that _.

Accepted Answer

A)   both require ATP
B)   both require a specific carrier or protein channel
C)   both can move substances up, as well as down, a concentration gradient
D)   both require a concentration gradientE) B) and C)
F) A) and D)

Question 11

Membrane transport may be passive or active. Select the active process from the list below.

Accepted Answer

A)   phagocytosis
B)   osmosis
C)   filtration
D)   simple diffusionE) A) and B)
F) A) and C) A

Question 12

Two important passive processes for membrane transport are _ .

Accepted Answer

A)   exocytosis and phagocytosis
B)   diffusion and filtration
C)   facilitated diffusion and active transport
D)   pinocytosis and receptor-mediated endocytosisE) B) and C)
F) C) and D) B

Question 13

The following substances enter cells by receptor-mediated endocytosis.

Accepted Answer

A)   liquids containing protein or fat
B)   glucose and amino acids
C)   cholesterol and iron
D)   Na+ and Cl- ionsE) B) and C)
F) A) and B)

Question 14

Red blood cells placed in a hypotonic solution will _.

Accepted Answer

A)   gain water and undergo crenation
B)   gain water and undergo hemolysis
C)   lose water and undergo hemolysis
D)   lose water and undergo crenationE) A) and C)
F) A) and B)

Question 15

A dialysis sac that is permeable to glucose and water is filled with water and placed in a beaker containing 20% glucose solution. Will there be a net transport of glucose across the dialysis sac? If so, in which direction will the glucose move, into the sac or out of the sac?

Accepted Answer

A)   Yes, glucose will move into the sac.
B)   Yes, glucose will move out of the sac.
C)   There is no net movement, but glucose will move back and forth across the membrane.
D)   No, there is no force to drive glucose across the membrane.E) All of the above
F) A) and D) A

Question 16

Does potassium permanganate diffuse more rapidly through water or through agar gel? Why?

Accepted Answer

A)   It diffuses more rapidly through water, because there are no particles to slow the movement of dye.
B)   It diffuses more rapidly through agar, because there are channels in agar that help the dye solution to move.
C)   It diffuses more rapidly through water, because there are more particles for the dye to bounce off of.
D)   It diffuses more rapidly through agar, because water attracts the dye molecules and slows their movement.E) A) and B)
F) C) and D)

Question 17

In this organ, filtration is the important first step in producing urine.

Accepted Answer

A)   lung
B)   liver
C)   heart
D)   kidneyE) B) and C)
F) All of the above

Question 18

Which substance uses a carrier protein to cross the plasma membrane by facilitated diffusion?

Accepted Answer

A)   Na+ ions
B)   water
C)   glucose
D)   Cl- ionsE) B) and C)
F) None of the above

Question 19

Red blood cells placed in 5% sodium chloride solution will .

Accepted Answer

A)   gain water and undergo crenation
B)   lose water and undergo hemolysis
C)   lose water and undergo crenation
D)   gain water and undergo hemolysisE) None of the above
F) B) and C)

Question 20

Select the statement about selective (or differential)  permeability that is false.

Accepted Answer

A)   It allows nutrients to enter cells.
B)   It keeps cellular wastes inside cells.
C)   It keeps valuable proteins inside cells.
D)   It prevents undesirable wastes from entering cells.E) A) and C)
F) A) and B)

Exam 5: The Cell: Transport Mechanisms and Cell Permeability

These molecules move through the lipid portion of the plasma membrane by simple diffusion.

Correct AnswerverifiedShow Answer

The force that causes water and solutes to cross cell membranes by filtration is _ .

Correct AnswerverifiedShow Answer

A dialysis sac that is permeable to glucose and water is filled with water and placed in a beaker containing 20% glucose solution. Will there be a net transport of water across the dialysis sac? If so, in which direction will the water move, into the sac or out of the sac?

Correct AnswerverifiedShow Answer

Which of the following statements is true?

Correct AnswerverifiedShow Answer

Filtration is a non-selective, passive process in which water and solutes are forced through a membrane by hydrostatic pressure. The following property limits movement of some solutes.

Correct AnswerverifiedShow Answer

Active processes .

Correct AnswerverifiedShow Answer

A membrane transport process is active if it requires .

Correct AnswerverifiedShow Answer

Molecule A has a molecular weight of 175 and Molecule B has a molecular weight of 450. A 0.1 M solution of each is placed on agar gel. Which molecule will diffuse more rapidly through the agar?

Correct AnswerverifiedShow Answer

A(n) in molecular size and a(n) in temperature result in an increased rate of diffusion.

Correct AnswerverifiedShow Answer

In comparing simple diffusion to facilitated diffusion, you note that _.

Correct AnswerverifiedShow Answer

Membrane transport may be passive or active. Select the active process from the list below.

Correct AnswerverifiedA

Two important passive processes for membrane transport are _ .

Correct AnswerverifiedB

The following substances enter cells by receptor-mediated endocytosis.

Correct AnswerverifiedShow Answer

Red blood cells placed in a hypotonic solution will _.

Correct AnswerverifiedShow Answer

A dialysis sac that is permeable to glucose and water is filled with water and placed in a beaker containing 20% glucose solution. Will there be a net transport of glucose across the dialysis sac? If so, in which direction will the glucose move, into the sac or out of the sac?

Correct AnswerverifiedA

Does potassium permanganate diffuse more rapidly through water or through agar gel? Why?

Correct AnswerverifiedShow Answer

In this organ, filtration is the important first step in producing urine.

Correct AnswerverifiedShow Answer

Which substance uses a carrier protein to cross the plasma membrane by facilitated diffusion?

Correct AnswerverifiedShow Answer

Red blood cells placed in 5% sodium chloride solution will .

Correct AnswerverifiedShow Answer

Select the statement about selective (or differential) permeability that is false.

Correct AnswerverifiedShow Answer

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