Q: Which equation best represents the direction of diffusion for a solute across a membrane?

$$\text{High concentration} \rightarrow \text{Low concentration}$$

Question 1

Which of the following molecules is most likely to diffuse directly across the cell membrane without the assistance of a transport protein?

Accepted Answer

Oxygen (O$$_2)$$

Question 2

A cell is placed in a solution containing a higher concentration of solutes than inside the cell. What will most likely happen to the cell?

Accepted Answer

It will lose water and shrink due to osmosis.

Question 3

Which process describes the movement of water across a selectively permeable membrane from an area of low solute concentration to high solute concentration?

Accepted Answer

Osmosis

Question 4

Why does facilitated diffusion not require energy from the cell?

Accepted Answer

Because molecules move down their concentration gradient

Question 5

Which of the following best describes selective permeability of the cell membrane?

Accepted Answer

Some molecules cross more easily than others due to membrane properties.

Question 6

A student observes that water moves into a plant cell, causing it to become turgid. Which type of solution is the cell in?

Accepted Answer

Hypotonic solution

Question 7

Which of the following is true about the movement of small non-polar molecules across the cell membrane?

Accepted Answer

They can diffuse directly through the lipid bilayer.

Question 8

If a cell is placed in an isotonic solution, what will happen to the movement of water across its membrane?

Accepted Answer

Water will move in and out at equal rates, maintaining equilibrium.

Question 9

Which of the following statements about passive transport is correct?

Accepted Answer

It includes diffusion, osmosis, and facilitated diffusion.

Question 10

A researcher adds a sugar solution to one side of a U-shaped tube separated by a selectively permeable membrane. Water moves toward the side with sugar. What principle explains this observation?

Accepted Answer

Osmosis due to a concentration gradient

Question 11

Which of the following would most likely require a transport protein to cross the cell membrane?

Accepted Answer

Glucose

Question 12

What is the main difference between simple diffusion and facilitated diffusion?

Accepted Answer

Facilitated diffusion uses transport proteins, while simple diffusion does not.

Question 13

Which equation best represents the direction of diffusion for a solute across a membrane?

Accepted Answer

$$	ext{High concentration} ightarrow 	ext{Low concentration}$$

Question 14

A cell membrane is described as selectively permeable. Which property of the membrane allows this selectivity?

Accepted Answer

Lipid bilayer structure and embedded proteins

Question 15

Which of the following is NOT a type of passive transport?

Accepted Answer

Endocytosis

Question 16

A cell is observed to have a net influx of water, causing it to burst. What type of solution was the cell placed in?

Accepted Answer

Hypotonic

Question 17

Which of the following best explains why glucose cannot diffuse directly through the cell membrane?

Accepted Answer

It is a large, polar molecule.

Question 18

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the diffusion of water across a selectively permeable membrane.

Question 19

Which of the following would increase the rate of facilitated diffusion for a specific molecule?

Accepted Answer

Increasing the number of transport proteins for that molecule

Question 20

Which of the following is a real-world example of passive transport in human physiology?

Accepted Answer

Oxygen diffusing from alveoli into blood capillaries

Membrane Transport and Facilitated Diffusion

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