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4 Written questions

2 Matching questions

  1. 77) According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly
    A) spread in a continuous layer over the inner and outer surfaces of the membrane.
    B) confined to the hydrophobic interior of the membrane.
    C) embedded in a lipid bilayer.
    D) randomly oriented in the membrane, with no fixed inside-outside polarity.
    E) free to depart from the fluid membrane and dissolve in the surrounding solution
  2. 39) In most cells, there are electrochemical gradients of many ions across the plasma membrane even though there are usually only one or two electrogenic pumps present in the membrane. The gradients of the other ions are most likely accounted for by
    A) cotransport proteins.
    B) ion channels.
    C) carrier proteins.
    D) passive diffusion across the plasma membrane.
    E) cellular metabolic reactions that create or destroy ions.
  1. a a
  2. b c

5 Multiple choice questions

  1. d
  2. e
  3. a
  4. d
  5. e

5 True/False questions

  1. 48) An organism with a cell wall would most likely be unable to take in materials through
    A) diffusion.
    B) osmosis.
    C) active transport.
    D) phagocytosis.
    E) facilitated diffusion.


  2. 14) An animal cell lacking oligosaccharides on the external surface of its plasma membrane would likely be impaired in which function?
    A) transporting ions against an electrochemical gradient
    B) cell-cell recognition
    C) maintaining fluidity of the phospholipid bilayer
    D) attaching to the cytoskeleton
    E) establishing the diffusion barrier to charged molecules


  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. 21) Cell membranes are asymmetrical. Which of the following is the most likely explanation?
    A) The cell membrane forms a border between one cell and another in tightly packed tissues such as epithelium.
    B) Cell membranes communicate signals from one organism to another.
    C) The two sides of a cell membrane face different environments and carry out different functions.
    D) The "innerness" and "outerness" of membrane surfaces are predetermined by genes.
    E) Proteins can only be associated with the cell membranes on the cytoplasmic side.


  5. 22) Which of the following is true of the evolution of cell membranes?
    A) Cell membranes have stopped evolving now that they are fluid mosaics.
    B) Cell membranes cannot evolve if the membrane proteins do not.
    C) The evolution of cell membranes is driven by the evolution of glycoproteins and glycolipids.
    D) All components of membranes evolve in response to natural selection.
    E) An individual organism selects its preferred type of cell membrane for particular functions.


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