Essential idea: Membranes control the composition of cells by active and passive transport.

This diagram is of the cell membrane and these questions relate to movement across the membrane.

cell membrane detailed

1. Which of the following most accurately describes the permeability of the cell membrane?

  • A. Impermeable
  • B. Fully permeable
  • C. Selectively permeable
  • D. Semi permeable
2. Which of the following is not a method by which particles can move across membranes?
  • A. Diffusion
  • B. Dissolving
  • C. Active transport
  • D. Facilitated diffusion
3. The fluidity of membranes aids which method of transport?
  • A. Diffusion
  • B. Active transport
  • C. Exocytosis
  • D. Osmosis

4. Which process is described in the following list of events?

Vesicle buds off from Golgi Apparatus

Modified proteins are carried to the plasma membrane

Vesicle fuses with the plasma membrane

The content of the vesicle is expelled

  • A. Active transport
  • B. Phagocytosis
  • C. Endocytosis
  • D. Exocytosis
5. What is essential for diffusion to occur across the membrane of a red blood cell?
  • A. An energy source, e.g. ATP
  • B. A glycoprotein
  • C. A concentration gradient
  • D. Cholesterol molecules

6. Hydrocarbon tails of phospholipids are in the centre of the membrane. Which of the following rows is correct?

  Centre of the membrane Polar molecules
A. Hydrophobic Pass easily through the membrane
B. Hydrophobic Do not pass easily through the membrane
C. Hydrophylic Pass easily through the membrane
D. Hydrophylic Do not pass easily through the membrane
7. Magnesium ions cannot pass through a plasma membrane by simple diffusion. Instead they pass through narrow channels in a process called facilitated diffusion. The walls of the channels consist of ...
  • A. glycogen
  • B. cholesterol
  • C. protein
  • D. phospholipids

8. What are the missing words in this passage?.

Osmosis is the ___X__movement of water molecules from a region of ___Y__solute concentration to a region of ___Z___solute concentration through the plasma membrane.

  X Y Z
A. active lower higher
B. net lower higher
C. passive higher lower
D. net higher lower
9. A cell, X, was placed into a solution containing a dye. After two hours the concentration of the dye inside cell X was higher than in the solution. This was repeated with an identical cell, Y,  in the presence of a substance that inhibits ATP. What would be the expected outcome two hours later in cell Y?
  • A. The concentration of blue dye inside cell Y was the same as cell X
  • B. No dye entered the cell Y
  • C. The concentration of blue dye inside the cell Y was greater than the concentration in cell X
  • D. The dye outside cell Y became more concentrated
10. Active transport is carried out by which type of molecule in the membrane?
  • A. Peripheral proteins
  • B. Phospholipids
  • C. Integral proteins
  • D. Cholesterol