Membrane structure & function
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1 Membrane structure & function Multiple Choice Identify the choice that best completes the statement or answers the question. 1. The phospholipid bilayer describes a structure with. a. polar layers on the outside and nonpolar layer on the inside b. nonpolar layers on the outside and a polar layer on the inside c. polar layers on both inside and outside d. nonpolar layers on both inside and outside 2. Because the phospholipid molecules and some proteins are free to move, the plasma membrane is said to be a. a. bilayer c. fluid mosaic b. solid d. fatty acid 3. A cell membrane lets certain things pass through, while denying others passage and is therefore said to have a. plasmolysis c. phagocytosis b. selective permeability d. dynamic equilibrium 4. The major component of the plasma membrane is a. carbohydrate c. phospholipids b. enzymes d. proteins Figure What would happen to the structure in Figure 7-4 if part D is completely removed? a. it would become solid and inflexible c. it would have holes in it b. it would disintegrate d. it would collapse in on itself 6. What structure in Figure 7-4 is a passage way for large polar molecules or ions? 7. Where are you least likely to find water in the structure shown in Figure 7-4 b. B d. E 8. The structure labeled B is part of a a. phospholipid c. cholesterol b. glycoprotein d. Endocytosis
2 9. Which of the following pictures in Figure 7-5 most likely approximate the motion phospholipids make in a plasma membrane? Figure The cell is in a state of equilibrium, with no Net movement of water when placed in a(n) _ solution. a. osmotic c. hypotonic b. hypertonic d. isotonic 11. A cell moves particles from a region of lesser concentration to a region of greater concentration by _. a. facilitated diffusion c. osmosis b. passive transport d. active transport 12. If a cell is placed in salt water, water leaves the cell by _. a. osmosis c. active transport b. diffusion d. phagocytosis 13. Which of the following is not a form of passive transport? a. simple diffusion c. facilitated diffusion b. endocytosis d. osmosis 14. The structure most responsible for maintaining cell homeostasis is the _. a. cytoplasm c. cell wall b. mitochondrion d. plasma membrane 15. Facillitated diffusion a. requires a membrane protein. c. moves molecules against a concentration gradient. b. requires ATP. d. transports small nonpolar molecules like Oxygen. 16. In simple diffusion a. energy from ATP is required c. molecules move against a concentration gradient b. small nonpolar molecules pass directly through the phospholipids 17. A human white blood cell engulfs, eats, a bacterial cell by: a. carrier-mediated facilitated diffusion. c. phagocytosis. b. exocytosis. d. pinocytosis. d. small nonpolar molecules pass through a protein, down a concentration gradient
3 18. The process illustrated bove is called: a. facilitated diffusion. c. cotransport. b. pinocytosis d. exocytosis 19. What cell process is responsible for the effect shown in Figure 8-5? Figure 8-5 a. active transport c. facilitated diffusion b. passive transport d. osmosis 20. Most phospholipids have a. 2 saturated tails c. one saturated, one unsaturated tail b. 2 unsaturated tails d. phospholipids dont have tails 21. The phosphate groups of a phospholipid are a. hydrophobic c. non-polar b. hydrophyllic d. none of these 22. These proteins are used for cell signaling a. receptor proteins c. enzymes b. transport proteins d. glycoproteins 23. these proteins span the width of the membrane a. peripheral proteins c. integral proteins b. transcontinental proteins d. smelly proteins 24. This type of active transport uses a source of energy that is not ATP a. uniport c. endocytosis b. co-transport d. exocytosis 25. When the cell membrane of a plant cell pulls away from the cell wall, this has happened a. cytolysis c.. b. plasmolysis d One substance moves against the gradient throught the same protein that another substance moves down the gradient, going opposite directions a. uniport c. antiport b. symport d Which of the following can not diffuse through phospholipids? a. oxygen c. glucose b. carbon dioxide d. wuter
4 28. When unequal amounts of a solute are found on opposite sides of a membrane a. concentration gradient c. Fluid Mosaic b. dymanic equilibrium d. isotonic 29. When solutes continue to cross the membrane despite being isotonic a. concentration gradient c. Fluid Mosaic b. dymanic equilibrium d. hypertonic 30. Which conditions shown in Figure 8-4 might cause a cell to burst? Figure Which letter, in fig 8-4, above shows a cell in a hypertonic solution? 32. A cell with 20% glucose and 10% sodium is in a solution with 10%glucose and 20% sodium. The membrane is impermeable to sodium. What kind of solution is the cell in after diffusion occurs? a. hypertonic c. isotonic b. hypotonic d..
5 Membrane structure & function Answer Section MULTIPLE CHOICE 1. ANS: A PTS: 1 DIF: B OBJ: ANS: C PTS: 1 DIF: B OBJ: ANS: B PTS: 1 DIF: B OBJ: ANS: C PTS: 1 DIF: B OBJ: ANS: A PTS: 1 DIF: A OBJ: ANS: C PTS: 1 DIF: A OBJ: ANS: D PTS: 1 DIF: A OBJ: ANS: B PTS: 1 9. ANS: C PTS: 1 DIF: A OBJ: ANS: D PTS: 1 DIF: B OBJ: ANS: D PTS: 1 DIF: B OBJ: ANS: A PTS: 1 DIF: B OBJ: ANS: B PTS: 1 DIF: B OBJ: ANS: D PTS: 1 DIF: B OBJ: ANS: A PTS: ANS: B PTS: ANS: C PTS: ANS: D PTS: ANS: C PTS: 1 DIF: A OBJ: ANS: C PTS: ANS: B PTS: ANS: A PTS: ANS: C PTS: ANS: B PTS: ANS: B PTS: ANS: C PTS: ANS: C PTS: ANS: A PTS: 1
6 29. ANS: B PTS: ANS: B PTS: 1 DIF: A OBJ: ANS: C PTS: ANS: B PTS: 1
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