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5 Written questions

5 Matching questions

  1. 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.
  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. 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
  4. Which membrane protein would be used to move glucose across a membrane from a region of higher concentration to a region of lower concentration?

    a) Transporter
    b) No protein is necessary.
    c) Pump
    d) Ion channel
  5. Which of the following particles could diffuse easily through a cell membrane?

    a) Oxygen (O2)
    b) Hydrogen ion (H+)
    c) Sodium ion (Na+)
    d) Glucose
  1. a 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.)
  2. b c) Amphipathic nature
  3. c a) Transporter

    (The GLUT-1 transporter assists the diffusion of glucose through the membrane.)
  4. d 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.)
  5. e a) Oxygen (O2) (Small nonpolar molecules such as oxygen can diffuse across cell membranes.)

5 Multiple choice questions

  1. b) The polarity of membrane phospholipids
  2. True (The hydrophilic, or water-loving, portion of a phospholipid is the polar head, whereas the hydrophobic portion is the nonpolar tail.)
  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. True (Osmosis is the diffusion of water across a selectively permeable membrane.)
  5. c) against the molecule's concentration gradient

5 True/False questions

  1. A semipermeable membrane is placed between the following solutions. Which solution will decrease in volume?

    a) Solution A: 1.4% (m/v) starch
    b) Solution B: 7.62% (m/v) starch
    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. True or false? Active transport differs from passive transport in that active transport does not require an input of energy.False

          

  3. Lipid vesicles are formed so that they contain pure water. If these vesicles are transferred to a solution that contains a rather high concentration of solutes, what will be the net direction of water movement?

    a) It will not move at all.

    b) It depends on what solute is dissolved in the exterior solution.

    c) It will move out of the vesicles.

    d) It will move into the vesicles.
    c) It will move out of the vesicles.

          

  4. 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
    (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.)

          

  5. 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
    c) It will move out of the vesicles.