Chapter 4 - Chapter 4 The Movement of Substances into and...

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Chapter 4: The Movement of Substances into and out of Cells Multiple-Choice Questions 1. Principles of Water Movement; p. 72; easy; ans: e Water potential is defined as the: a. tendency of water to enter a cell. b. tendency of water to leave a cell. c. mechanical energy of water. d. kinetic energy of water. e. potential energy of water. 2. Principles of Water Movement; p. 73; easy; ans: c The long-distance transport of sap in the phloem is an example of: a. simple diffusion. b. facilitated diffusion. c. pressure-driven bulk flow. d. active transport. e. exocytosis. 3. Principles of Water Movement; p. 73; easy; ans: c By convention, the water potential of pure water at atmospheric pressure and at sea level is set at ______ bars. a. –10 b. –5 c. 0 d. 10 e. 20 4. Principles of Water Movement; p. 73; moderate; ans: b In the absence of other factors affecting water potential, water will move FROM a region of ______ TO a region of ______. a. low water concentration; high water concentration b. low solute concentration; high solute concentration c. low water potential; high water potential d. low potential energy; high potential energy e. low pressure; high pressure
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2 Chapter 4 The Movement of Substances into and out of Cells 5. Principles of Water Movement; p. 73; moderate; ans: e Which of the following could be the water potential of a sucrose solution at atmospheric pressure and at sea level? a. 100 MPa b. 100 bars c. 10 bars d. 0 bars e. –10 MPa 6. Principles of Water Movement; p. 73; moderate; ans: b Suppose a drop of dye is placed in one end of a tank of water. What happens next? a. Nothing happens because the molecules are at equilibrium. b. The dye molecules and the water molecules move down their respective concentration gradients. c. The dye molecules move from a region of high water potential to a region of low water potential. d. The dye molecules move against a concentration gradient. e. The water molecules move by osmosis. 7. Principles of Water Movement; p. 74; moderate; ans: a Which of the following statements about diffusion is FALSE? a. When the diffusing molecules become evenly distributed, their movement stops. b. Each of the diffusing molecules moves randomly and independently of the others. c. It is more rapid at higher than at lower temperatures. d. It involves the net movement of a substance. e. It is more rapid in gases than in liquids. 8. Cells and Diffusion; p. 74; moderate; ans: c Which of the following substances is LEAST likely to diffuse across the plasma membrane? a. Water b. A small, uncharged polar molecule c. An ion d. Carbon dioxide e. Oxygen 9. Cells and Diffusion; p. 74; difficult; ans: b Which of the following statements about solute movement in cells is FALSE? a. Once a substance is inside a cell, it moves through the cell by diffusion. b. Diffusion is an effective way to move substances between distantly separated cells.
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  • Fall '12
  • Fertuck
  • Osmosis, a. b. c., b. c. d., Water Movement

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