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5 Written questions

4 Matching questions

  1. 8) Which of the following is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold?
    A) by increasing the percentage of unsaturated phospholipids in the membrane
    B) by increasing the percentage of cholesterol molecules in the membrane
    C) by decreasing the number of hydrophobic proteins in the membrane
    D) by cotransport of glucose and hydrogen
    E) by using active transport
  2. 3) Singer and Nicolson's fluid mosaic model of the membrane proposed that
    A) membranes are a phospholipid bilayer.
    B) membranes are a phospholipid bilayer between two layers of hydrophilic proteins.
    C) membranes are a single layer of phospholipids and proteins.
    D) membranes consist of protein molecules embedded in a fluid bilayer of phospholipids.
    E) membranes consist of a mosaic of polysaccharides and proteins.
  3. 35) Which of the following membrane activities require energy from ATP hydrolysis?
    A) facilitated diffusion of chloride ions across the membrane through a chloride channel
    B) movement of water into a cell
    C) Na+ ions moving out of a mammalian cell bathed in physiological saline
    D) movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than inside the cell
    E) movement of carbon dioxide out of a paramecium
  4. 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
  1. a e
  2. b c
  3. c d
  4. d a

5 Multiple choice questions

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

5 True/False questions

  1. 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.


  2. 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.


  3. 6) The presence of cholesterol in the plasma membranes of some animals
    A) enables the membrane to stay fluid more easily when cell temperature drops.
    B) enables the animal to remove hydrogen atoms from saturated phospholipids.
    C) enables the animal to add hydrogen atoms to unsaturated phospholipids.
    D) makes the membrane less flexible, allowing it to sustain greater pressure from within the cell.
    E) makes the animal more susceptible to circulatory disorders.


  4. 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.


  5. 26) Nitrous oxide gas molecules diffusing across a cell's plasma membrane is an example of
    A) diffusion across the lipid bilayer.
    B) facilitated diffusion.
    C) active transport.
    D) osmosis.
    E) cotransport.


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