Ch05_National_Exam_Helper

Ch05_National_Exam_Helper - Chapter 5 National Exam Helper...

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Multiple Choice 3. Substances move through biological membranes against concentration gradients via a. simple osmosis. b. active transport. c. reverse osmosis. d. simple diffusion. e. None of the above Answer: b 8. The compounds in biological membranes that form a barrier to the movement of materials across the membrane are a. integral membrane proteins. b. carbohydrates. c. lipids. d. nucleic acids. e. peripheral membrane proteins. Answer: c 9. The interior of the phospholipid bilayer is a. hydrophilic. b. hydrophobic. c. aqueous. d. solid. e. charged. Answer: b 10. 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. Answer: a 11. A protein that forms an ion channel through a membrane is most likely to be a. a peripheral protein. b. an integral protein. c. a phospholipid. d. an enzyme.
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Ch05_National_Exam_Helper - Chapter 5 National Exam Helper...

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