Cell Membrane And Transport Exam: Quiz!

31 Questions | Total Attempts: 206

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Cell Membrane And Transport Exam: Quiz!

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Questions and Answers
  • 1. 
    When the concentration of molecules on both sides of a membrane is the same, the molecules will
    • A. 

      Move across the membrane to the outside of the cell.

    • B. 

      Stop moving across the membrane.

    • C. 

      Move across the membrane in both directions.

    • D. 

      Move across the membrane to the inside of the cell.

  • 2. 
    Diffusion takes place
    • A. 

      Only through a lipid bilayer membrane.

    • B. 

      From an area of low concentration to an area of high concentration.

    • C. 

      Only in liquids.

    • D. 

      From an area of high concentration to an area of low concentration.

  • 3. 
    Which of the following is a function of the cell membrane?
    • A. 

      Breaks down lipids, carbohydrates, and proteins from foods

    • B. 

      Stores water, salt, proteins, and carbohydrates

    • C. 

      Keeps the cell wall in place

    • D. 

      Regulates which materials enter and leave the cell

  • 4. 
    The diagram shows a cell membrane composed of a phospholipid bilayer with a channel protein. Each x represents the same type of molecule inside or outside the cell. Facilitated diffusion moves these molecules across the cell membrane. In what direction do these molecules move and through which structure?
    • A. 

      Into the cell through the channel protein

    • B. 

      Into the cell through the phospholipid bilayer

    • C. 

      Out of the cell through the channel protein

    • D. 

      Out of the cell through the phospholipid bilayer

  • 5. 
    Which of the following structures serves as the cell’s boundary from its environment?
    • A. 

      Mitochondrion

    • B. 

      Cell membrane

    • C. 

      Chloroplast

    • D. 

      Channel proteins

  • 6. 
    The cell membrane contains channels and pumps that help move materials from one side to the other. What are these channels and pumps made of?
    • A. 

      Carbohydrates

    • B. 

      Lipids

    • C. 

      Bilipids

    • D. 

      Proteins

  • 7. 
    Which of the following does NOT use energy?
    • A. 

      Diffusion

    • B. 

      Endocytosis

    • C. 

      Active transport

    • D. 

      A sodium-potassium pump

  • 8. 
     Which means of particle transport requires energy from the cell?
    • A. 

      Diffusion

    • B. 

      Osmosis

    • C. 

      Facilitated diffusion

    • D. 

      Active transport

  • 9. 
    When scientists stain natural cell membranes with a heavy metal, they can view the membranes with an electron microscope. The heavy metal stains the polar hydrophilic heads of phospholipid membranes. When viewed under a microscope, would appear stained? (Note: Shading represents stains.)
    • A. 
    • B. 
    • C. 
    • D. 
  • 10. 
    Proteins are produced by ribosomes, modified by rough ER, and then packaged by the Golgi apparatus. By what process do these packaged proteins exit a cell through the cell membrane?
    • A. 

      Active transport

    • B. 

      Exocytosis

    • C. 

      Facilitated diffusion

    • D. 

      Osmosis

  • 11. 
    Refer to the illustration above. The process shown is called
    • A. 

      Osmosis.

    • B. 

      Facilitated diffusion.

    • C. 

      Active transport.

    • D. 

      Diffusion.

  • 12. 
    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?
    • A. 

      The solution is hypertonic to the cell.

    • B. 

      The solution and the cell have equal concentrations of solutes.

    • C. 

      The solution is hypotonic to the cell.

    • D. 

      The solution and the cell have equal concentrations of water.

  • 13. 
    The diffusion of water across a selectively permeable membrane is called
    • A. 

      Osmotic pressure.

    • B. 

      Osmosis.

    • C. 

      Facilitated diffusion.

    • D. 

      Active transport.

  • 14. 
    Equilibrium is maintained through diffusion. Which of the following would represent equilibrium?
    • A. 

      The concentration always remains greater inside a membrane.

    • B. 

      The concentration eventually becomes balanced on both sides of a membrane.

    • C. 

      The concentration always remains greater on the outside of a membrane.

    • D. 

      The concentration becomes imbalanced on both sides of a membrane.

  • 15. 
    The sodium-potassium pump is an example of 
    • A. 

      Contractile vacuoles

    • B. 

      Osmosis

    • C. 

      Active transport

    • D. 

      Facilitated diffusion

  • 16. 
    Sugar molecules are large and cannot go through the lipid bilayer. If there is a high concentration of sugar outside the cell, these molecules can ENTER cells through the process of
    • A. 

      Exocytosis.

    • B. 

      Facilitated diffusion.

    • C. 

      Osmosis.

    • D. 

      Ion pumps.

  • 17. 
    Food molecules and bacteria that are too large to be moved through the membrane can be transported INTO the cell by
    • A. 

      Osmosis.

    • B. 

      Endocytosis.

    • C. 

      Lipid carriers.

    • D. 

      Diffusion.

  • 18. 
    Placing a plant into a hypertonic environment will
    • A. 

      Cause turgor pressure to increase because water is moving into the cell.

    • B. 

      Cause the vacuole to swell.

    • C. 

      Have no effect.

    • D. 

      Cause turgor pressure to decrease because water is moving out of the cell.

  • 19. 
    Red blood cells have a salt content of 0.9%. When a microbiologist places red blood cells in pure water, osmosis occurs. Where do the molecules move in this instance of osmosis?
    • A. 

      Water molecules move out of the cells.

    • B. 

      Water molecules move into the cells.

    • C. 

      Salt ions move out of the cells.

    • D. 

      Salt ions move into the cells.

  • 20. 
    A Paramecium lives in an environment that is hypotonic to its cytoplasm. How does the Paramecium maintain homeostasis under these conditions?
    • A. 

      It expels (pumps out) excess water using contractile vacuoles.

    • B. 

      It expels (pumps out) excess sodium using the sodium-potassium pump.

    • C. 

      It absorbs additional water through osmosis.

    • D. 

      It absorbs additional sodium through facilitated diffusion.

  • 21. 
    Diffusion takes place
    • A. 

      Only through a lipid bilayer membrane.

    • B. 

      From an area of low concentration to an area of high concentration.

    • C. 

      Only in liquids.

    • D. 

      From an area of high concentration to an area of low concentration.

  • 22. 
    The dispersal of ink in a beaker of water is an example of
    • A. 

      Diffusion.

    • B. 

      Osmosis.

    • C. 

      Active transport.

    • D. 

      Endocytosis.

  • 23. 
    Passive transport is the movement of molecules from
    • A. 

      An area of low concentration to an area of high concentration.

    • B. 

      An area of high concentration to an area of low concentration.

    • C. 

      An area of equilibrium to an area of high concentration.

    • D. 

      An area of low concentration to an area of equilibrium.

  • 24. 
    Active transport is the movement of molecules from
    • A. 

      An area of low concentration to an area of high concentration.

    • B. 

      An area of high concentration to an area of low concentration.

    • C. 

      An area of high concentration to an area of equilibrium.

    • D. 

      An area of low concentration to an area of equilibrium

  • 25. 
    Pure water is always hypotonic to cells. An animal cell that is surrounded by pure water will burst because the osmotic pressure causes
    • A. 

      Water to move into the cell.

    • B. 

      Water to move out of the cell.

    • C. 

      Solutes to move into the cell.

    • D. 

      Solutes to move out of the cell.