Chapter 7 Quiz Flashcards


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biology i cellular processes
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1

Which of the following statements about a typical plasma membrane is correct?

  • The plasma membrane is a covalently linked network of phospholipids and proteins that controls the movement of solutes into and out of a cell.
  • The two sides of the plasma membrane have different lipid and protein composition.
  • The hydrophilic interior of the membrane is composed primarily of the fatty acid tails of the phospholipids.
  • Carbohydrates on the membrane surface are important in determining the overall bilayer structure.

The two sides of the plasma membrane have different lipid and protein composition.

2

The permeability of a biological membrane to a specific polar solute depends primarily on which of the following?

  • the phospholipid composition of the membrane
  • the presence of unsaturated fatty acids in the membrane
  • the types of polysaccharides present in the membrane
  • the types of transport proteins in the membrane

the types of transport proteins in the membrane

3

The presence of aquaporins (proteins that form water channels in the membrane) should speed up the process of osmosis.

  • True
  • False

True

4

In facilitated diffusion, transport proteins provide a hydrophobic route for the solute to cross the membrane.

  • True
  • False

False

Ex.

Actually should be, "In facilitated diffusion, transport proteins provide a hydrophillic route for the solute to cross the membrane."

5

The movement of glucose into a cell against a concentration gradient is most likely to be accomplished by which of the following?

  • facilitated diffusion of the glucose using a carrier protein
  • passive diffusion of the glucose through the lipid bilayer
  • cotransport of the glucose with a proton or sodium ion that was pumped across the membrane using the energy of ATP hydrolysis
  • movement of glucose into the cell through receptor-mediated endocytosis

cotransport of the glucose with a proton or sodium ion that was pumped across the membrane using the energy of ATP hydrolysis