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5 Written questions

5 Matching questions

  1. What distinguishes facilitated diffusion from simple diffusion?

    a) Molecules move from a region of lower concentration to a region of higher concentration.

    b) No energy is used to move molecules across the membrane.

    c) Membrane proteins help move molecules across the membrane.

    d) Molecules move from a region of higher concentration to a region of lower concentration.
  2. True or false? Osmosis is a type of diffusion.
  3. The movement of molecules through a plasma membrane channel protein is always _____.

    a) toward the inside of the cell

    b) down the molecule's concentration gradient

    c) against the molecule's concentration gradient

    d) "paid for" by an expenditure of cellular energy
  4. 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
  5. 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.
  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 (Osmosis is the diffusion of water across a selectively permeable membrane.)
  3. c c) against the molecule's concentration gradient
  4. d c) Membrane proteins help move molecules across the membrane.
  5. e True (The hydrophilic, or water-loving, portion of a phospholipid is the polar head, whereas the hydrophobic portion is the nonpolar tail.)

5 Multiple choice questions

  1. a) Solution A: 1.4% (m/v) starch (The water molecules actually move in both directions, but they move to a greater extent toward Solution B because it has a higher solute concentration than Solution A. The net movement of water molecules causes Solution A to decrease in volume and Solution B to increase in volume.)
  2. b) The polarity of membrane phospholipids
  3. c) Amphipathic nature
  4. a) Transporter

    (The GLUT-1 transporter assists the diffusion of glucose through the membrane.)
  5. c) It will move out of the vesicles.

5 True/False questions

  1. 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.

          

  2. Lactose transport by membrane proteins occurs under conditions in which the concentration of lactose inside the cell is higher than the concentration outside the cell. What type of transport is used to move lactose into the cell?

    a) Active transport
    b) Simple diffusion
    c) Facilitated diffusion
    d) Osmosis
    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.)

          

  3. 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.
    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.)

          

  4. Which of the following transporters does not use passive transport to move molecules across a membrane?



    a) Sodium-potassium pump
    b) Gramicidin ion channel
    c) Valinomycin
    d) GLUT-1 glucose transporter
    a) Sodium-potassium pump
    (This pump uses the energy provided by ATP hydrolysis to transport sodium and potassium ions across the membrane.)

          

  5. True or false? Active transport differs from passive transport in that active transport does not require an input of energy.False