Bio 141 Chapters 5to6-tAKE HOME TEST2

Bio 141 Chapters 5to6-tAKE HOME TEST2 - Biology 141 Test...

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Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. The phospholipid molecules of most membranes have A. a hydrophobic head and a hydrophilic tail. B. a hydrophobic head and a hydrophobic tail. C. a hydrophobic head and two hydrophobic tails. D. a hydrophilic head and two hydrophobic tails. E. none of these 2. Hydrophobic reactions of phospholipids can produce clusters of their fatty acid tails to form A. a lipid bilayer. B. hydrolysis of the fatty acids. C. a protein membrane. D. a cytoskeleton. E. a nonpolar membrane. 3. Which of the following statements is true? A. When lipids and water are mixed, it is the water molecules that isolate themselves into droplets. B. When lipids and water are mixed, the lipids dissolve and enter into a solution. C. Lipids are classified as nonpolar substances and will not mix with water. D. Polar substances are able to pass through a plasma membrane more readily than nonpolar substances. E. All portions of a phospholipid molecule found in a membrane are classified as nonpolar. 4. A hypothetical "microbullet" shot through a phospholipid bilayer would pass the components in which order? A. tail >>> tail >>> head >>> head B. head >>> tail >>> head >>> tail C. tail >>> head >>> head >>> tail D. head >>> tail >>> tail >>> head E. head >>> head >>> tail >>> tail 5. If a plasma membrane were compared to a sandwich, __________ would be considered the filling. A. cholesterol B. protein C. hydrophilic heads D. hydrophobic tails E. carbohydrates
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6. Unsaturated tails of lipids A. are hydrophilic. B. are unstable and tend to break apart. C. have kinks in them and lessen the interaction between adjacent fat molecules. D. will break whenever exposed to phosphate ions. E. all of these 7. The relative impermeability of membranes to water-soluble molecules is a result of A. the nonpolar nature of water molecules. B. the presence of large proteins that extend through both sides of membranes. C. the presence of inorganic salt crystals scattered through some membranes. D. the presence of cellulose and chemicals such as cutin, lignin, pectin, and suberin in the membranes. E. the presence of phospholipids in the lipid bilayer. 8. Which statement is NOT true? A. Membranes are often perforated by proteins that extend through both sides of the membrane. B. Some membranes have proteins with channels or pores that allow for the passage of hydrophilic substances. C. Hydrophilic substances have an easier time passing through membranes than do hydrophobic substances. D. The current concept of a membrane can be best summarized by the fluid mosaic model. E. The lipid bilayer serves as a hydrophobic barrier between two fluid regions. 9. In an attempt to visualize the fluid mosaic model of a membrane, we could describe the __________ as
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Bio 141 Chapters 5to6-tAKE HOME TEST2 - Biology 141 Test...

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