Chapter 6 - Guided Reading Cells and the Extracellular...

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Guided Reading - Cells and the Extracellular Environment I 1. Which of the following is a function of the steep Na + /K + gradient across the cell membrane? A. provides energy for coupled transport B. creates electrochemical impulses C. maintains osmotic pressure D. All of these choices are correct. 2. Ions like Ca 2+ can be second messengers for cell signaling. True False 3. Hypertonic solutions stimulate cellular lysis. True False 4. In secondary active transport, if the other substance is moved in the same direction as Na + , it is called 5. ___________ g of sucrose (molecular weight = 342g) would be added to 1L of water to produce a 2.5 Osm solution. A. 342 B. 500 C. 855 D. 2.5 6. The Na + /K + pump creates a ____________ charge inside the cell. A. positive B. negative 7. Which of the following is NOT true of cyclic AMP? 8. Epithelial cells have a polarity dealing with transport. True False 9. 80% of the extracellular fluid is termed interstitial fluid. True False 10. How much of the extracellular fluid makes up the blood plasma?
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11. Why are cells in body organs generally within 100 μ m of a blood capillary? A. to decrease mean diffusion time B. to increase mean diffusion time C. so that larger particles can diffuse more easily D. a larger distance maximizes entropy 12. How much of the total body water content is in the intracellular compartment? 13. A cell placed in a 9% saline solution (molecular weight = 58.5g) would 14. Secondary active transport often occurs as a coupled transport process. True False 15. Facilitated diffusion is unable to transport molecules against a concentration gradient. True False 16. Inhibition of receptor-mediated endocytosis 17. The osmotic pressure exerted by a cell would decrease if the cell synthesized more proteins. True False 18. Active transport proteins are often regulated by phosphorylation. True False 19. What type of functional complex will prohibit paracellular transport? A. tight junctions B. adherens junctions C. desmosomes D. gap junctions
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