Exam 3 BIO 140 KEY - Biology 140, Spring 2008 Exam 3 (62...

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1 Biology 140, Spring 2008 Exam 3 (62 questions) Record your answers on the scantron form provided (use a #2 pencil) 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. 2. 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. 3. In most 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. 4. 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. 5. Houseplants adapted to indoor temperatures may die when accidentally left outdoors in the cold because their A. DNA cannot function. B. membranes lack adequate fluidity. C. photosynthesis is impaired due to problems with membranes D. chloroplasts malfunction due to problems with membranes E. membranes need more cholesterol. 6. A protein that forms an ion channel through a membrane is most likely to be A. a peripheral protein. B. a transmembrane protein. C. a phospholipid. D. an enzyme. E. entirely outside the phospholipid bilayer. 7. The hydrophilic regions of a membrane protein are most likely to be found A. only in muscle cell membranes. B. associated with the fatty acid region of the lipids. C. in the interior of the membrane. D. exposed on the surface of the membrane. E. There is no hydrophilic region in membrane proteins.
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2 8. A characteristic of plasma membranes that helps them fuse during vesicle formation and phagocytosis is the A. ratio of one protein molecule for every 25 phospholipid molecules. B. capacity of lipids to associate and maintain a bilayer organization. C. constant fatty acid chain length and degree of saturation. D. ability of phospholipid molecules to flip over and trade places with other phospholipid molecules. E. asymmetrical distribution of membrane proteins. 9. The LDL receptor is an integral protein that crosses the plasma membrane, with portions of the
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This note was uploaded on 04/24/2008 for the course BIOLOGY 140 taught by Professor Mullin during the Spring '08 term at University of Tennessee.

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Exam 3 BIO 140 KEY - Biology 140, Spring 2008 Exam 3 (62...

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