Unit 2 Target 4: Cell Membrane And Homeostasis

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    Which of the following structures serves as the cell's boundary from its environment?

    • Mitochondrion
    • Cell membrane
    • Chloroplast
    • Channel proteins
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About This Quiz

Explore the functions and importance of the cell membrane in maintaining homeostasis. This quiz covers topics like osmotic pressure, isotonic solutions, and the role of the cell membrane in regulating material exchange, crucial for students understanding cellular processes.

Unit 2 Target 4: Cell Membrane And Homeostasis - Quiz

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  • 2. 

    Which of the following is a function of the cell membrane?

    • Breaks down lipids, carbs, and proteins from food

    • Stores water, salt, proteins, and carbs

    • Keeps the cell wall in place

    • Regulates which materials enter and leave the cell

    Correct Answer
    A. Regulates which materials enter and leave the cell
    Explanation
    The cell membrane is responsible for regulating which materials enter and leave the cell. It acts as a selectively permeable barrier, allowing certain substances to pass through while preventing others from entering or leaving the cell. This function is crucial for maintaining the cell's internal environment and ensuring that necessary nutrients and molecules are able to enter, while waste products and harmful substances are kept out.

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  • 3. 

    The plasma membrane

    • Encloses the contents of a cell.

    • Allows material to enter and leave the cell.

    • Is selectively permeable.

    • All of the above.

    Correct Answer
    A. All of the above.
    Explanation
    The plasma membrane is the outer boundary of a cell that encloses its contents. It is responsible for controlling the movement of materials in and out of the cell, making it selectively permeable. Therefore, the correct answer is "All of the above" because the plasma membrane encloses the cell, allows materials to enter and leave, and is selectively permeable.

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  • 4. 

    An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes

    • Water to move into the cell.

    • Water to move out of the cell.

    • Solutes to move into the cell.

    • Solutes to move out of the cell.

    Correct Answer
    A. Water to move into the cell.
    Explanation
    When an animal cell is surrounded by fresh water, the concentration of solutes is higher inside the cell compared to the surrounding water. This creates a concentration gradient, causing water molecules to move from an area of lower solute concentration (the fresh water) to an area of higher solute concentration (inside the cell). This movement of water into the cell is known as osmosis. As a result, the cell will gain water and eventually burst. Therefore, the correct answer is "water to move into the cell."

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  • 5. 

    A scientist places a cell in a solution, and over time the cell gains mass and swells. What is the most likely explanation for the cell’s gain in mass?

    • The solution is hypertonic to the cell.

    • The solution and the cell have equal concentrations of solutes.

    • The solution is hypotonic to the cell.

    • The solution and the cell have equal concentrations of water.

    Correct Answer
    A. The solution is hypotonic to the cell.
    Explanation
    The most likely explanation for the cell's gain in mass is that the solution is hypotonic to the cell. In a hypotonic solution, the concentration of solutes is lower outside the cell compared to inside the cell. As a result, water moves into the cell through osmosis, causing the cell to swell and gain mass.

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  • 6. 

    Biochemists have created an artificial cell membrane that they hope to insert into artificial red blood cells for future dehydration and transportation into outer space.When scientists stain natural cell membranes with a heavy metal, they can view the membranes with an electron microscope. The heavy metal stains the nonpolar hydrophobic tails of phospholipid membranes. If the artificial membranes resemble natural membranes, what area(s), when viewed under a microscope, would appear stained? (Note: Shading represents stains.)

    Correct Answer
    A.
    Explanation
    The correct answer is the hydrophobic tails of the artificial membranes.

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  • 7. 

    When the concentration of molecules on both sides of a membrane is the same (Isotonic solution), the molecules will

    • Move across the membrane to the outside of the cell.

    • Stop moving across the membrane.

    • Move across the membrane in both directions.

    • Move across the membrane to the inside of the cell.

    Correct Answer
    A. Move across the membrane in both directions.
    Explanation
    In an isotonic solution, the concentration of molecules on both sides of a membrane is the same. This means that there is no net movement of molecules across the membrane. However, individual molecules will still move across the membrane in both directions, but at equal rates. This is because the concentration gradient is balanced, resulting in an equal movement of molecules in and out of the cell. Therefore, the correct answer is that molecules will move across the membrane in both directions.

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  • Mar 14, 2023
    Quiz Edited by
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  • Sep 26, 2014
    Quiz Created by
    Jdowdyrobinson
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