Deck 5: The Cell: Transport Mechanisms and Cell Permeability

Question 1

A membrane transport process is active if it requires .

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

Answer 1

C

Question 2

A solution is said to be isotonic if it contains .

A)the same number of nonpenetrating solute particles as the interior of cells
B)more nonpenetrating solute particles than the interior of cells
C)fewer nonpenetrating solute particles than the interior of cells

Answer 2

A

Question 3

Which of the following endocytotic processes is important for moving fluid into cells?

A)phagocytosis
B)pinocytosis
C)receptor- mediated endocytosis for water
D)receptor- mediated endocytosis for hormones

Answer 3

B

Question 4

In healthy people, it is good practice to use isotonic solutions for injections into veins of the circulatory system because .

A)isotonic solutions maintain the normal volume and function of red blood cells
B)hypotonic solutions cause red blood cells to crenate
C)hypertonic solutions cause red blood cells to bloat and lyse

Question 5

The following substances enter cells by receptor- mediated endocytosis.

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

Question 6

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

A)liver
B)lung
C)heart
D)kidney

Question 7

Active processes .

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

Question 8

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

A)filtration
B)osmosis
C)simple diffusion
D)phagocytosis

Question 9

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

A)decrease, decrease
B)increase, increase
C)increase, decrease
D)decrease, increase

Question 10

In comparing simple diffusion to facilitated diffusion, you note that:

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

Question 11

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

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

Question 12

Which statement is true?

A)Passive processes require ATP.
B)Active processes require ATP.
C)Passive processes require no forces to move molecules across membranes.
D)Active processes require a concentration gradient.

Question 13

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

A)Cl- ions
B)water
C)glucose
D)Na+ ions

Question 14

Which of the following is true about osmosis?

A)Osmosis is the flow of water across a plasma membrane.
B)Solutes always accompany the movement of water during osmosis.
C)Osmosis occurs when the concentration of water is the same as the concentration of solutes.
D)Water may move up or down a concentration gradient during osmosis.

Question 15

Filtration is not selective. However this property limits movement of some solutes.

A)size of the membrane pores
B)strength of the hydrostatic pressure gradient
C)tonicity of the solution being filtered
D)temperature of the fluid

Question 16

Which statement about vesicular transport is true?

A)Pinocytosis is used to take liquids into a cell.
B)Exocytosis transports particles/molecules into the cell.
C)Endocytosis transports particles/molecules out of the cell.
D)Phagocytosis is used to move cell wastes out of the cell.

Question 17

A group of cells that are permeable to water are placed in a beaker of hypotonic solution. Will there be a net movement of water across the cell membranes? If so, will it move into or out of the cells?

A)Yes, water moves out of the cells.
B)Yes, water moves into the cells.
C)No, there is no movement of water across the cell membranes.
D)No, there will not be a net movement of water across the cell membranes, but water does move into and out of the cells.

Question 18

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

A)Na+ and Cl-
B)glucose
C)CO2 and O2
D)K+ and Ca2+

Question 19

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?

A)molecule B
B)They will move at the same rate.
C)molecule A

Question 20

Two important passive processes for membrane transport are _ .

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

Question 21

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

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

Question 22

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?

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

Question 23

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

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

Question 24

In the body, filtration is important in moving .

A)lymph fluid through lymph vessels
B)blood around the circulatory system
C)fluid and solutes out of the capillaries and into the kidney tubules
D)all of these

Question 25

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?

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