Which of the following statements about a typical plasma membrane is correct?
a. Phospholipids are the primary component that determines which solutes can cross the plasma membrane.
b. The plasma membrane is a covalently linked network of phospholipids and proteins that controls the movement of solutes into and out of a cell.
c. Carbohydrates on the membrane surface are important in determining the overall bilayer structure.
d. The two sides of the plasma membrane have different lipid and protein composition.
e. The hydrophilic interior of the membrane is composed primarily of the fatty acid tails of the phospholipids.
d. The two sides of the plasma membrane have different lipid and protein composition.

Because the membrane serves different functions on the cytoplasmic and exterior surfaces, the structure and composition of the surfaces must be different.

Which of the following best describes the structure of a biological membrane?

a. two layers of phospholipids with proteins either crossing the layers or on the surface of the layers
b. two layers of phospholipids (with opposite orientations of the phospholipids in each layer) with each layer covered on the outside with proteins
c. two layers of phospholipids with proteins embedded between the two layers
d. a fluid structure in which phospholipids and proteins move freely between sides of the membrane
e. a mixture of covalently linked phospholipids and proteins that determines which solutes can cross the membrane and which cannot

a. two layers of phospholipids with proteins either crossing the layers or on the surface of the layers

*The membrane proteins can be found either embedded in or attached to the surface of the phospholipid bilayer.

The permeability of a biological membrane to a specific polar solute may depend on which of the following?
the types of transport proteins in the membrane
Which of the following is least likely to be important in holding the components of a biological membrane together?
covalent interactions between the phospholipid and protein components of the membrane
Which of the following statements about osmosis is correct?
The presence of aquaporins (proteins that form water channels in the membrane) should speed up the process of osmosis.

*Aquaporins facilitate water movement across membranes and thus speed up the process of osmosis.

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