Animal Physiology From Genes To Organisms 2nd Edition By Lauralee Sherwood - Test Bank

b. they have polar heads and nonpolar tails. c. they have polar tails and nonpolar heads. d. the phospho-portion can form phosphodiester bonds between adjacent phospe. two of these. c 70, 71 3. The lipid bilayer is held together mainly by a. covalent bonding between membrane lipids. b. hydrogen-bonding between the phospholipids’ tails. c. repulsion between the phospholipids’ tails and water. d. covalent bonding between the ends of phospholipids tails in opposite layee. hydrogen-bonding between the head groups of the phospholipids. b 70 4. Cell membranes have a ____ structure with the polar head groups of the phospholipids facinaqueous environment and the ____ facing toward the interior of the membranea. bilayer, hydrophilic tails b. bilayer, hydrophobic tails c. micellar, hydrophilic tails d. liposomal, hydrophilic tails e. liposomal, hydrophobic tails e 71, 72 5. Cholesterol is a membrane lipid that a. reduces the permeability of gill membranes to water. b. affects the activity of membrane proteins. c. regulates membrane fluidity and stability. d. two of these. e. all of these. c 71 6. Which of the following statements regarding lipid membranes is true? a. Phospholipids will spontaneously form liposomes in nonpolar solventsb. A solution of pure fatty acids forms a lipid bilayer in a polar solvent. c. Membrane lipids move laterally within their own layer. d. Membrane lipids frequently move between one layer of the bilayer and the e. The preferred form of a lipid bilayer in water is a flat sheet with exposed e