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Chapter 5: The Dynamic Cell Membrane TEST FILE QUESTIONS Multiple Choice 1. The compounds in biological membranes that form a barrier to the movement of hydrophilic materials across the membrane are a. integral membrane proteins. b. carbohydrates. c. lipids. d. nucleic acids. e. peripheral membrane proteins. Textbook Reference: 5.1 What Is the Structure of a Biological Membrane? p. 97 2. Biological membranes are composed of a. nucleotides and nucleosides. b. enzymes, electron acceptors, and electron donors. c. fatty acids. d. monosaccharides. e. lipids, proteins, and carbohydrates. Textbook Reference: 5.1 What Is the Structure of a Biological Membrane? p. 97 3. Which of the following statements about the proteins of the plasma membrane and the proteins of the inner mitochondrial membrane is true? a. Both membranes have only peripheral proteins. b. Only the mitochondrial membrane has integral proteins. c. Only the mitochondrial membrane has peripheral proteins. d. All of the proteins from both membranes are hydrophilic. e. The two membranes differ in their lipid composition. Textbook Reference: 5.1 What Is the Structure of a Biological Membrane? p. 97 4. The plasma membrane of animals contains carbohydrates a. on the inner side of the membrane, facing the cytosol. b. on the outer side of the membrane, protruding into the environment. c. on both sides of the membrane. d. on neither side of the membrane. e. within the membrane. Textbook Reference: 5.1 What Is the Structure of a Biological Membrane? p. 97 5. In biological membranes, the phospholipids are arranged in a a. bilayer, with the fatty acids pointing toward each other. b. bilayer, with the fatty acids facing outward. c. single layer, with the fatty acids facing the interior of the cell. d. single layer, with the phosphorus-containing region facing the interior of the cell. e. bilayer, with the phosphorus groups in the interior of the membrane. Textbook Reference: 5.1 What Is the Structure of a Biological Membrane? p. 98 6. Cholesterol molecules act to a. help hold a membrane together. b. transport ions across membranes. c. attach to carbohydrates. d. disrupt membrane function. e. alter the fluidity of the membrane. Textbook Reference: 5.1 What Is the Structure of a Biological Membrane? p. 98 7. Peripheral membrane proteins have a. hydrophobic regions within the lipid portion of the bilayer. b. hydrophilic regions that protrude in aqueous environments on either side of the membrane. c. lateral but not vertical movement within the bilayer. d. control over the rate of diffusion. e. polar regions that interact with similar regions of integral membrane proteins. Textbook Reference: 5.1 What Is the Structure of a Biological Membrane? p. 99 8. The functional roles for different proteins found in membranes include all except a. allowing movement of molecules that would otherwise be excluded by the lipid components of the membrane.... View Full Document

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