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5 Written questions

5 Multiple choice questions

  1. c
  2. d
  3. d
  4. b
  5. d

5 True/False questions

  1. 12) Which of the following is true of integral membrane proteins?
    A) They lack tertiary structure.
    B) They are loosely bound to the surface of the bilayer.
    C) They are usually transmembrane proteins.
    D) They are not mobile within the bilayer.
    E) They serve only a structural role in membranes.


  2. 34) When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur?
    A) The cell will burst.
    B) The cell membrane will lyse.
    C) Plasmolysis will shrink the interior.
    D) The cell will become flaccid.
    E) The cell will become turgid.


  3. Cystic fibrosis is a genetic disease in humans in which the CFTR protein, which functions as a chloride ion channel, is missing or nonfunctional in cell membranes.

    71) The CFTR protein belongs to what category of membrane proteins?
    A) gap junctions
    B) aquaporins
    C) electrogenic ion pumps
    D) cotransporters
    E) hydrophilic channels


  4. 41) Which of the following is most likely true of a protein that cotransports glucose and sodium ions into the intestinal cells of an animal?
    A) The sodium ions are moving down their electrochemical gradient while glucose is moving up.
    B) Glucose entering the cell along its concentration gradient provides energy for uptake of sodium ions against the electrochemical gradient.
    C) Sodium ions can move down their electrochemical gradient through the cotransporter whether or not glucose is present outside the cell.
    D) The cotransporter can also transport potassium ions.
    E) A substance that blocks sodium ions from binding to the cotransport protein will also block the transport of glucose.


  5. 1) Who was/were the first to propose that cell membranes are phospholipid bilayers?
    A) H. Davson and J. Danielli
    B) I. Langmuir
    C) C. Overton
    D) S. Singer and G. Nicolson
    E) E. Gorter and F. Grendel


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