Osmosis- Simple Quiz

10 Questions

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Osmosis Quizzes & Trivia

Why does the concentration of a solute cause the movement of water through osmosis? Water is unusual in that it can cross a non-polar membrane but also react and form solutions with ions and polar molecules that cannot cross the same membrane. When water molecules react with a solute they are no longer free to cross the membrane. The more solute, the fewer molecules left that are free to diffuse across the membrane. Therefore a highly concentrated solution (one with lots of solute) has a low effective concentration of water. Therefore water will tend to diffuse across a membrane from areas of low solute concentration to areas of high solute concentration – until the concentration of the solution is equal on both sides. This is only true if the solute cannot cross the membrane.


Questions and Answers
  • 1. 
    When a membrane that is permeable to both a solute and water separates water with a high osmolarity from water with a low osmolarity...
    • A. 

      The water will only move through the membrane in one direction while the solute will move through the membrane in the other.

    • B. 

      The solute will pass through the membrane in both directions until equilibrium is reached on both sides of the membrane for the solute.

    • C. 

      Both the water and the solute will pass through the membrane in both directions until equilibrium is reached on both sides of the membrane for both water and the solute.

    • D. 

      The motion of the molecules of both the solute and water will cease when equilibrium is reached.

    • E. 

      None of the above

  • 2. 
    • A. 

      The water will diffuse through the membrane until there is an equal volume of solute on both sides.

    • B. 

      The water will diffuse through the membrane until there is an equal volume of water on both sides.

    • C. 

      The water will diffuse through the membrane until there is an equal concentration of water on both sides.

    • D. 

      The water will diffuse through the membrane until there is an equal concentration of solute on both sides.

    • E. 

      The water will diffuse through the membrane until there is an equal concentration of solute and water on both sides.

  • 3. 
    Water is more concentrated in...
    • A. 

      the solution on the side of the membrane with the least solute.

    • B. 

      The solution on the side of the membrane with the most solute.

    • C. 

      The solution on the one side of the membrane that has reached equilibrium.

    • D. 

      The solution on either side of the membrane that has reached equilibrium.

    • E. 

      The solution on neither side of the membrane due to the constant motion of the molecules.

  • 4. 
    Water molecules will no longer pass through the semipermeable membrane once equilibrium is reached.
    • A. 

      True

    • B. 

      False

  • 5. 
    Osmosis can be described as both the diffusion of a liquid from an area of high concentration of that liquid to an area of a low concentration of that liquid, and, as the diffusion of a liquid from a low concentration of solutes to an area of high concentration of solutes.
    • A. 

      True

    • B. 

      False

  • 6. 
    Osmosis is best defined as the movement of
    • A. 

      Molecules from an area of high concentration to an area of lower concentration

    • B. 

      Molecules from an area of low concentration to an area of higher concentration.

    • C. 

      Water molecules across a membrane from an area of low water to an area of higher concentration.

    • D. 

      Water molecules across a membrane from an area of high water concentration to an area of lower concentration.

    • E. 

      Water molecules inside a container.

  • 7. 
    Which of the following will pass through a cell membrane most easily?
    • A. 

      small polar molecules

    • B. 

      Small nonpolar molecules

    • C. 

      Large polar molecules

    • D. 

      Large nonpolar molecules

    • E. 

      Large neutral molecules

  • 8. 
    A red blood cell placed in a hypertonic medium will
    • A. 

      Expand.

    • B. 

      Burst.

    • C. 

      Shrink.

    • D. 

      Have no change in shape.

    • E. 

      Become a white blood cell.

  • 9. 
    A 5% urea solution is hypotonic to a 10% urea solution.
    • A. 

      True

    • B. 

      False

  • 10. 
    If a cell is placed in an isotonic medium, there will be no net movement of water.
    • A. 

      True

    • B. 

      False