Question 1

Which of the following best explains why the mass of red blood cells decreases as the sucrose concentration increases, as shown in the graph?

Accepted Answer

Water moves out of the cells by osmosis into the hypertonic sucrose solution.

Question 2

Based on the graph, at which sucrose concentration is the solution most likely isotonic to the red blood cells?

Accepted Answer

$$0.22 M$$

Question 3

If a red blood cell is placed in a $$1.0 M $$sucrose solution, what will most likely happen to its mass and why?

Accepted Answer

Its mass will decrease because water will leave the cell due to the hypertonic environment.

Question 4

Which of the following statements about osmosis is supported by the data in the graph?

Accepted Answer

Water moves from areas of low solute concentration to areas of high solute concentration.

Question 5

If the natural solute concentration inside the red blood cells is approximately $$0.22 M$$, what would happen if the cells are placed in a $$0.0 M $$sucrose solution?

Accepted Answer

The cells would gain mass as water enters by osmosis.

Question 6

Which of the following best describes a hypertonic solution in the context of the experiment shown in the graph?

Accepted Answer

A solution with a higher solute concentration than the inside of the red blood cells.

Question 7

Suppose the experiment is repeated with plant cells instead of red blood cells. What is a likely difference in the outcome at high sucrose concentrations?

Accepted Answer

Plant cells will undergo plasmolysis but retain their cell wall structure.

Question 8

Which equation best represents the net movement of water during osmosis in this experiment?

Accepted Answer

$$\Delta \Psi = \Psi_{inside} - \Psi_{outside}$$, where water moves from high to low water potential.

Question 9

If the mass change of red blood cells is zero at a certain sucrose concentration, what does this indicate about the solution?

Accepted Answer

The solution is isotonic to the red blood cells.

Question 10

If a mutation caused red blood cells to become impermeable to water, what would you expect to observe in the experiment?

Accepted Answer

There would be no change in mass regardless of sucrose concentration.

Unit 2 Practice Assessment Study Guide – General Biology I

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