Review 2.4-2.6: Membranes and Transport (AP Bio)

Which of the following is NOT a main component of plasma membranes?

• Triglycerides

• Phospholipids

• Cholesterol

• Proteins

Which statement describes the behavior of the hydrophobic tail in the phospholipid bilayer?

• Attracts water

• Repels water

• Synthesizes proteins

• Produces energy

What characteristic of the phospholipid bilayer allows it to form a barrier?

• Its rigidity

• Its flexibility

• Its hydrophilic and hydrophobic regions

• Its thickness

What is the primary function of the plasma membrane?

• Energy production

• Genetic information storage

• Cell barrier and cell transport

• Protein synthesis

Which part(s) of a phospholipid interact with the internal and external environments of the cell?

• The glycerol and phosphate

• The fatty acid tails

• The polypeptide chains

• The hydrocarbon chains

What is the role of vesicles in cellular transport?

• DNA storage

• Protein synthesis

• Transporting materials

• Energy production

What is the effect of cholesterol molecules on membrane fluidity at body temperature?

• Increases membrane fluidity

• Decreases membrane fluidity

• Does not affect fluidity

Which type of integral proteins span the entire membrane?

• Monotopic proteins

• Transmembrane proteins

• Peripheral proteins

• Lipid-anchored proteins

What is the correct description of transmembrane proteins in the plasma membrane?

• They are loosely bound to the surface

• They span the entire membrane

• They are only on one side of the membrane

• They are involved in cell signaling

Which plasma membrane would be the most fluid?

• A membrane at a low temp with a lot of unsaturated fatty acids

• A membrane at a low temp with a lot of saturated fatty acids

• A membrane at a high temp with a lot of unsaturated fatty acids

• A membrane at a high temp with a lot of saturated fatty acids