NAME: ________________________

Mastering Biology Osmosis and Diffusion Test

Question Types


Start With


Question Limit

of 20 available terms

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. 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
  3. True or false? Active transport differs from passive transport in that active transport does not require an input of 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. In cells, membrane proteins are responsible for the passage of substances that can't cross the membrane on their own. Channels and transporters are involved in facilitated diffusion. Pumps are involved in active transport. In terms of their properties or functions, which statement most accurately describes how these three types of membrane proteins compare?

    a) Among the three types, only pumps are thought to undergo a shape change as part of their function.

    b) Pumps are selective; channels and transporters are not selective.

    c) Channels and transporters are integral membrane proteins; pumps are peripheral membrane proteins.

    d) Among the three types, only pumps can concentrate substances on one side of the membrane.
  1. a 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.)
  2. b False
  3. c 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.)
  4. d a) Transporter

    (The GLUT-1 transporter assists the diffusion of glucose through the membrane.)
  5. e 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.)

5 Multiple Choice Questions

  1. c) Membrane proteins help move molecules across the membrane.
  2. c) Amphipathic nature
  3. a) Sodium-potassium pump
    (This pump uses the energy provided by ATP hydrolysis to transport sodium and potassium ions across the membrane.)
  4. 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. a) Lipids are mostly nonpolar.

5 True/False Questions

  1. 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.)

          

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

          

  3. 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.)

          

  4. 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.

          

  5. 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
    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.)

          

Create Set