A.P._Chapter_7_Test_Web - A.P Chapter 7 Test Multiple...

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A.P. Chapter 7 Test Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following types of molecules are the major structural components of the cell membrane? a. phospholipids and cellulose d. proteins and cellulose b. nucleic acids and proteins e. glycoproteins and cholesterol c. phospholipids and proteins For the following questions, match the labeled component of the cell membrane in the figure below with its description. 2. peripheral protein a. A b. B c. C d. D e. E 3. fiber of the extracellular matrix a. A b. B c. C d. D e. E 4. The presence of cholesterol in the plasma membranes of some animals a. enables the membrane to stay fluid more easily when cell temperature drops. b. enables the animal to remove hydrogen atoms from saturated phospholipids. c. enables the animal to add hydrogen atoms to unsaturated phospholipids. d. makes the membrane less flexible, allowing it to sustain greater pressure from within the cell. e. makes the animal more susceptible to circulatory disorders. 5. According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids? a. They can move laterally along the plane of the membrane. b. They frequently flip-flop from one side of the membrane to the other. c. They occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane. d. They are free to depart from the membrane and dissolve in the surrounding solution. e. They have hydrophilic tails in the interior of the membrane. 6. What is one of the ways that the membranes of winter wheat are able to remain fluid when it is extremely cold? a. by increasing the percentage of unsaturated phospholipids in the membrane
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b. by increasing the percentage of cholesterol molecules in the membrane c. by decreasing the number of hydrophobic proteins in the membrane d. A and B only e. A, B, and C 7. The surface of an integral membrane protein would be best described as a. hydrophilic. b. hydrophobic. c. amphipathic. d. completely covered with phospholipids. e. exposed on only one surface of the membrane. 8. When a membrane is freeze-fractured, the bilayer splits down the middle between the two layers of phospholipids. In an electron micrograph of a freeze-fractured membrane, the bumps seen on the fractured surface of the membrane are a. peripheral proteins. d. integral proteins. b. phospholipids. e. cholesterol molecules. c. carbohydrates. 9. All of the following are functions of integral membrane proteins except a. protein synthesis. d. cell adhesion. b. active transport. e. cytoskeleton attachment. c. hormone reception. 10. Which of the following is a reasonable explanation for why unsaturated fatty acids help keep any membrane more fluid at lower temperatures? a.
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This note was uploaded on 12/01/2009 for the course BIO 071265836 taught by Professor Solana during the Spring '09 term at Air Force Institute of Technology, Ohio.

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A.P._Chapter_7_Test_Web - A.P Chapter 7 Test Multiple...

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