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Membrane Structure And Function

14 Questions
Membrane Structure And Function

This quiz covers our lesson over membrane structure and function.

Questions and Answers
  • 1. 
    Which one represents facilitated diffusion?
    • A. 

      I

    • B. 

      II

    • C. 

      III

    • D. 

      I and II

    • E. 

      I and III

  • 2. 
    Does a cell expend energy for facilitated diffusion?
    • A. 

      Yes

    • B. 

      No

    • C. 

      Sometimes

  • 3. 
    Which one shows active transport?
    • A. 

      I

    • B. 

      II

    • C. 

      III

    • D. 

      I and II

    • E. 

      I and III

  • 4. 
    Which one shows diffusion?
    • A. 

      I

    • B. 

      III

    • C. 

      I and III

  • 5. 
    Which of these is/are considered passive transport?
    • A. 

      I, not II

    • B. 

      II, not I

    • C. 

      I and II

    • D. 

      I and III

    • E. 

      I, II, and III

  • 6. 
    A solution of 1 M glucose is separated by a selectively permeable membrane from a solution of 0.2 M fructose and 0.7 M sucrose.  The membrane is NOT permeable to the sugar molecules, only to water.  Indicate which side is initially hypertonic to the other side.
    • A. 

      Side A

    • B. 

      Side B

    • C. 

      Neither A nor B

  • 7. 
    Facilitated diffusion across a cellular membrane requires ______________ and moves a solute ______________ its concentration gradients. 
    • A. 

      Energy and transport proteins; down

    • B. 

      Energy and transport proteins; against

    • C. 

      Energy; against

    • D. 

      Transport proteins; down

    • E. 

      Transport proteins; up

  • 8. 
    The fluidity of membranes in a plant in cold weather may be maintained by
    • A. 

      Increasing the number of phospholipids with saturated hydrocarbon tails.

    • B. 

      Activating an H+ pump.

    • C. 

      Increasing the concentration of cholesterol in the membrane.

    • D. 

      Increasing the proportion of peripheral proteins.

    • E. 

      Increasing the number of phospholipids with unsaturated hydrocarbon tails.

  • 9. 
    A plant cell placed in a hypotonic environment will
    • A. 

      Plasmolyze.

    • B. 

      Shrivel.

    • C. 

      Become turgid.

    • D. 

      Become flaccid.

    • E. 

      Lyse.

  • 10. 
    The fluid mosaic model describes biological membranes as consisting of
    • A. 

      A phospholipid bilayer with proteins sandwiched between the layers.

    • B. 

      A lipid bilayer with proteins coating the outside of this hydrophobic structure.

    • C. 

      A phospholipid bilayer with proteins embedded in and attached to it.

    • D. 

      A protein bilayer with phospholipids embedded in it.

    • E. 

      A cholesterol bilayer with proteins embedded in the hydrophobic center.

  • 11. 
    Pinocytosis involves
    • A. 

      The fusion of a newly formed food vacuole with a lysosome.

    • B. 

      Receptor-mediated endocytosis and the formation of vesicles.

    • C. 

      The pinching in of the plasma membrane around small droplets of external fluid.

    • D. 

      Pseudopod extension as vesicles move along the cytoskeleton and fuse with the plasma membrane.

    • E. 

      The accumulation of specific large molecules in a cell.

  • 12. 
    Which of the following letters consists of areas that have both hydrophilic and hydrophobic parts?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

    • E. 

      E

  • 13. 
    Which of the following areas consists of a protein's hydrophobic section?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

    • E. 

      E

  • 14. 
    Which of the following is the hydrophilic head group of a phospholipid?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

    • E. 

      E