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5 Written questions

5 Matching questions

  1. If a red blood cell is placed in a salt solution and bursts, what is the tonicity of the solution relative to the interior of the cell?

    a) Hypotonic
    b) Hypertonic
    c) Osmotic
    d) Isotonic
  2. What property of dishwashing liquid (detergent) makes it useful to wash grease from pans?

    a) Hydrophobic nature
    b) Permeability
    c) Amphipathic nature
    d) Solubility in water
  3. True or false? The water-soluble portion of a phospholipid is the polar head, which generally consists of a glycerol molecule linked to a phosphate group.
  4. Which of the following statements is true about the net movement of an ion across a membrane by passive diffusion through a membrane channel?

    a) The charge on the other side of the membrane is generally the opposite of the ion's charge.

    b) There is a higher concentration of ions on the side of the membrane toward which the ion diffuses.

    c) For every ion that diffuses through the membrane, a different ion diffuses in the opposite direction.

    d) The cell expends energy as the ion passes through the membrane.
  5. A semipermeable membrane is placed between the following solutions. Which solution will increase in volume?

    a) Solution C: 9% (m/v) NaCl
    b) Solution D: 12.4% (m/v) NaCl
  1. a b) Solution D: 12.4% (m/v) NaCl (The water molecules actually move in both directions, but they move to a greater extent toward Solution D because it has a higher solute concentration than Solution C. This net movement of water molecules causes Solution D to increase in volume and Solution C to decrease in volume.)
  2. b True (The hydrophilic, or water-loving, portion of a phospholipid is the polar head, whereas the hydrophobic portion is the nonpolar tail.)
  3. c a) Hypotonic (The salt concentration in the solution is lower than it is in the cell, so water enters the cell, causing it to burst.)
  4. d c) Amphipathic nature
  5. e a) The charge on the other side of the membrane is generally the opposite of the ion's charge.

    (Ions tend to move toward regions of unlike charge.)

5 Multiple choice questions

  1. c) Membrane proteins help move molecules across the membrane.
  2. b) The polarity of membrane phospholipids
  3. d) Among the three types, only pumps can concentrate substances on one side of the membrane.

    (Only pumps use energy (from ATP) to move substances against electrochemical gradients.)
  4. a) Active transport

    (Under these conditions, lactose moves against its concentration gradient, so its transport will require energy.)
  5. c) It will move out of the vesicles.

5 True/False questions

  1. True or false? Osmosis is a type of diffusion.True (Osmosis is the diffusion of water across a selectively permeable membrane.)


  2. What name is given to the process by which water crosses a selectively permeable membrane?

    a) osmosis
    b) diffusion
    c) pinocytosis
    d) phagocytosis
    e) passive transport
    a) osmosis (Osmosis is the passive transport of water.)


  3. True or false? During active transport through the sodium-potassium pump, ATP hydrolysis provides the energy to pump three sodium ions into the cell for every two potassium ions pumped out of the cell.False


  4. How can a lipid be distinguished from a sugar?

    a) Lipids are mostly nonpolar.
    b) Lipids are mostly saturated.
    c) A lipid dissolves in water.
    d) A lipid is made up of only hydrocarbons.
    a) Lipids are mostly nonpolar.


  5. True or false? Active transport differs from passive transport in that active transport does not require an input of energy.False
    (The sodium-potassium pump maintains a state in which the concentration of sodium is low inside the cell relative to the outside and the concentration of potassium is high inside the cell relative to the outside; thus, three sodium ions are pumped out of the cell and two potassium ions are pumped into the cell against the electrochemical gradient.)


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