Chapter 7 Quiz Flashcards

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

• True
• False

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

• True
• False

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