Q: Which equation best represents the direction of water movement during osmosis?

$$\text{Water moves from a region of lower solute concentration to higher solute concentration}$$

Question 1

Which of the following best describes osmosis?

Accepted Answer

The diffusion of water across a selectively permeable membrane.

Question 2

Why do cells use aquaporins to transport water more quickly across the plasma membrane?

Accepted Answer

Because water can cross the lipid bilayer slowly, but aquaporins provide a faster, selective pathway.

Question 3

Which solution has more free water available for osmosis: a 1 M solution of sugar or a 0.1 M solution of sugar?

Accepted Answer

The 0.1 M solution of sugar.

Question 4

A red blood cell is placed in a hypotonic solution. What is the most likely outcome?

Accepted Answer

The cell will gain water and lyse.

Question 5

Which of the following best explains why ions cannot easily cross the plasma membrane?

Accepted Answer

Ions are charged and interact unfavorably with the hydrophobic core of the lipid bilayer.

Question 6

Which equation best represents the direction of water movement during osmosis?

Accepted Answer

$$	ext{Water moves from a region of lower solute concentration to higher solute concentration}$$

Question 7

A cell is placed in an isotonic solution. What will happen to the cell?

Accepted Answer

There will be no net movement of water; the cell remains normal.

Question 8

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

Accepted Answer

Active transport

Question 9

What is the primary function of aquaporins in the plasma membrane?

Accepted Answer

To allow water to diffuse rapidly across the membrane.

Question 10

If a plant cell is placed in a hypertonic solution, what will happen?

Accepted Answer

The cell will lose water and undergo plasmolysis.

Question 11

Which of the following statements about tonicity is correct?

Accepted Answer

A hypertonic solution causes a cell to lose water.

Question 12

Which process is responsible for the movement of water into a cell placed in pure distilled water?

Accepted Answer

Osmosis

Question 13

A cell with a solute concentration of 0.5 M is placed in a solution with a solute concentration of 0.2 M. What type of solution is this for the cell, and what will happen?

Accepted Answer

Hypotonic; cell gains water.

Question 14

Which of the following best explains the concept of 'free water' in osmosis?

Accepted Answer

Water molecules that are not in a hydration shell and are available for osmosis.

Question 15

Which of the following would increase the rate of osmosis across a cell membrane?

Accepted Answer

Increasing the number of aquaporins in the membrane.

Question 16

A medical technician accidentally places red blood cells in a solution with a much lower solute concentration than the cytoplasm. What is the most likely result?

Accepted Answer

The cells will lyse due to water influx.

Question 17

Which of the following is true regarding the movement of water in osmosis?

Accepted Answer

Water moves toward the region with higher solute concentration.

Question 18

Which of the following scenarios would result in no net movement of water into or out of a cell?

Accepted Answer

The cell is placed in an isotonic solution.

Question 19

Which of the following is a real-world example of osmosis affecting human health?

Accepted Answer

Red blood cells lysing when exposed to pure water during medical procedures.

Question 20

Which of the following statements about osmosis is FALSE?

Accepted Answer

Osmosis requires energy in the form of ATP.

Chapter 7 Part B: (Osmosis and Water Balance in Cells)

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