1. Active Lecture Questions Copyright © 2011 Pearson Education Inc. Chapter 5 Cell Membrane Structure and Function

2. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which of the following is nonpolar? 1.Fatty acid tails 2.Water channels 3.Water 4.Phospholipid heads

3. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which of the following is nonpolar? 1.Fatty acid tails 2.Water channels 3.Water 4.Phospholipid heads

4. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e The term “fluid mosaic model” refers to: 1.An experiment that shows the function of the cell membrane. 2.The dynamic flow of proteins and lipids within the membrane. 3.The cell membrane’s ability to communicate with the fluid portions of the cell. 4.The cell’s ability to communicate with the fluid portions of the membrane.

5. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e The term “fluid mosaic model” refers to: 1.An experiment that shows the function of the cell membrane. 2.The dynamic flow of proteins and lipids within the membrane. 3.The cell membrane’s ability to communicate with the fluid portions of the cell. 4.The cell’s ability to communicate with the fluid portions of the membrane.

6. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e An organism living at the equator has more saturated phospholipids in its cell membranes than an organism living at the South Pole. Why? 1.In cold climates, more unsaturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 2.In cold climates, more saturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 3.In warm climates, more unsaturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 4.In warm climates, more saturated fats with kinked tails are needed to maintain the fluidity of the cell membranes.

7. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e An organism living at the equator has more saturated phospholipids in its cell membranes than an organism living at the South Pole. Why? 1.In cold climates, more unsaturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 2.In cold climates, more saturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 3.In warm climates, more unsaturated fats with kinked tails are needed to maintain the fluidity of the cell membranes. 4.In warm climates, more saturated fats with kinked tails are needed to maintain the fluidity of the cell membranes.

8. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e The phospholipid tails of the membrane face one another because: 1.They are hydrophilic—repelled by water. 2.They are hydrophobic—attracted to water. 3.They are hydrophilic—attracted to water. 4.They are hydrophobic—repelled by water.

9. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e The phospholipid tails of the membrane face one another because: 1.They are hydrophilic—repelled by water. 2.They are hydrophobic—attracted to water. 3.They are hydrophilic—attracted to water. 4.They are hydrophobic—repelled by water.

10. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which of the following is NOT a function of cell membrane proteins? 1.To move hydrophilic substances across the plasma membrane 2.To communicate with other cells 3.To isolate the inside of the cell from the outside 4.To identify cell type

11. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which of the following is NOT a function of cell membrane proteins? 1.To move hydrophilic substances across the plasma membrane 2.To communicate with other cells 3.To isolate the inside of the cell from the outside 4.To identify cell type

12. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which is NOT a form of active transport? 1.Pinocytosis 2.Receptor-mediated transport 3.Phagocytosis 4.Osmosis

13. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which is NOT a form of active transport? 1.Pinocytosis 2.Receptor-mediated transport 3.Phagocytosis 4.Osmosis

14. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which cell has the highest surface area/volume ratio? 1.A cell with a radius of 10 units 2.A cell with a radius of 20 units 3.A cell with a radius of 50 units 4.A cell with a radius of 100 units

15. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which cell has the highest surface area/volume ratio? 1.A cell with a radius of 10 units 2.A cell with a radius of 20 units 3.A cell with a radius of 50 units 4.A cell with a radius of 100 units

16. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e A semipermeable membrane separates two solutions, permitting water, but not larger molecules, to pass. Side A contains a 20% sugar solution. Side B contains a 40% sugar solution. At equilibrium, what condition is true? 1.Side A will be hypertonic to side B. 2.Side A will be hypotonic to side B. 3.Side A will be isotonic to side B. 4.Side B will be hypotonic to side A.

17. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e A semipermeable membrane separates two solutions, permitting water, but not larger molecules, to pass. Side A contains a 20% sugar solution. Side B contains a 40% sugar solution. At equilibrium, what condition is true? 1.Side A will be hypertonic to side B. 2.Side A will be hypotonic to side B. 3.Side A will be isotonic to side B. 4.Side B will be hypotonic to side A.

18. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which membrane process requires molecules to bind to a membrane protein? 1.Water movement through channels 2.Oxygen diffusion through the membrane 3.Receptor-mediated transport 4.Lipid movement across membranes

19. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which membrane process requires molecules to bind to a membrane protein? 1.Water movement through channels 2.Oxygen diffusion through the membrane 3.Receptor-mediated transport 4.Lipid movement across membranes

20. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Facilitated diffusion uses what kind of protein? 1.Recognition 2.Enzyme 3.Attachment 4.Carrier

21. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Facilitated diffusion uses what kind of protein? 1.Recognition 2.Enzyme 3.Attachment 4.Carrier

22. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e The salt concentration of the fluid surrounding a cell is more concentrated than the fluid inside the cell. The cell will: 1.Shrink. 2.Swell. 3.Stay the same. 4.Transport salt into the cell.

23. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e The salt concentration of the fluid surrounding a cell is more concentrated than the fluid inside the cell. The cell will: 1.Shrink. 2.Swell. 3.Stay the same. 4.Transport salt into the cell.

24. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e What type of cell junctions are needed for a tissue that must prevent fluids from leaking across its cell layer? 1.Desmosomes 2.Tight junctions 3.Gap junctions 4.Plasmodesmata

25. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e What type of cell junctions are needed for a tissue that must prevent fluids from leaking across its cell layer? 1.Desmosomes 2.Tight junctions 3.Gap junctions 4.Plasmodesmata

26. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e In active transport, the energy source that moves a molecule against its concentration gradient is: 1.Glucose. 2.NADPH. 3.NADH. 4.ATP.

27. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e In active transport, the energy source that moves a molecule against its concentration gradient is: 1.Glucose. 2.NADPH. 3.NADH. 4.ATP.

28. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Animal cells communicate with one another through: 1.Desmosomes. 2.Tight junctions. 3.Gap junctions. 4.Plasmodesmata.

29. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Animal cells communicate with one another through: 1.Desmosomes. 2.Tight junctions. 3.Gap junctions. 4.Plasmodesmata.

30. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which of the transport processes in the figure below results in the movement of molecules from a high to a low concentration? 1.Only a 2.Only c 3.a and c 4.a, b, c, and d Figure 5-7

31. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Which of the transport processes in the figure below results in the movement of molecules from a high to a low concentration? 1.Only a 2.Only c 3.a and c 4.a, b, c, and d Figure 5-7

32. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e Figure E5-1 In the figure below, what is the correct association? 1.Trunk lipids: high fatty acid fluidity 2.Trunk lipids: unsaturated fatty acids 3.Leg lipids: low fatty acid fluidity 4.Leg lipids: unsaturated fatty acids

33. Copyright © 2011 Pearson Education Inc.Biology: Life on Earth, 9e In the figure below, what is the correct association? 1.Trunk lipids: high fatty acid fluidity 2.Trunk lipids: unsaturated fatty acids 3.Leg lipids: low fatty acid fluidity 4.Leg lipids: unsaturated fatty acids Figure E5-1