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Station A 1. Does permeable mean: able to pass through or NOT able to pass through? 2. Does impermeable mean: able to pass through or NOT able to pass through? Look at the following U-tube below. The two sides of the tube are separated by a selectively permeable membrane, such as dialysis tubing. The membrane is permeable to water and to the simple sugars, glucose and fructose. The membrane is completely impermeable to the larger carbohydrate, starch. L Water, glucose, & fructose 3. Can the fructose move? ___ 4. Can the glucose move? ___ 5. Can the starch move? ___ R Water, glucose, fructose, & starch Station B The illustration shown is a cell model with starch solutions both inside and outside the cell. Label the % of water inside and outside of each model given. The % shown refers to the solute 6. Outside - _____ 7. Inside - _____ 16. Circle the situation where water will move out of the cell. 17. How do you know? 8. Outside - _____ 9. Inside - _____ 10.Outside - _____ 11.Inside - _____ 18. Put a star by the situation where the solution rise the highest in the tube. (water going IN) Station C Joseph designed an experiment to determine the amount of solute contained in an egg. First he soaked the eggs in vinegar to dissolve their shells, leaving on the membrane. Next, three eggs were massed and placed in syrup solutions of 30%, 60%, and 90% concentration, while the remaining egg was placed in distilled water and left to sit overnight. The next class period he massed the eggs a final time. His results are summarized in the data table shown. 12. Calculate the change in mass for each egg. Be sure to indicate if mass was lost or gained. Put this table in your notebook: Egg # 1 Change In mass (g) 2 3 13. At what percent (estimate) is the egg isotonic to syrup solution? Explain. 4 Station D 14. Which statement below is always true in living things a. Water always moves from higher/greater to lower/lesser concentrations. b. Water always moves from lower/lesser to higher/greater concentrations. c. Neither statement is always true. 15. Where is the water percentage the higher: beaker or cell? 16. Which way will the water move: into or out of the cell? 17. Therefore, will the cell get larger, increasing in mass or will it shrink, decreasing in mass? __________ Station E Solution A Solution B Solvent Solvent Solute Solute __________ __________ 18. If you were comparing the two solutions above, which would be hypertonic and which would be hypotonic? Label accordingly. 19. If water could move between the two solutions (but not the solute), water would move from ______ to _____. Station F Often concentrations of solutions are expressed is M. This is a unit (molar) that just tells you how concentrated the solution is with solute. 20.Which sucrose solution has the highest concentration of sucrose in it (so the least water)? Put a star over the one that has the least sucrose in it (so the most water)? 0.8 M 0.6 M 0.4 M 0.2 M 0M Five dialysis bags (A – B – C – D – E) were filled with various concentrations of sucrose and then placed in separate beakers containing an INITIAL concentration of 0.6 M sucrose solution. The bags were impermeable to sucrose. At 10-minute intervals, the bags were massed and the percent change in mass of each bag was graphed. 21. Which bag gained the most water? __________ 22. If that bag gained water, what type of solution must it have been in (hypertonic, hypotonic, isotonic)? 23. Which bag lost the most water? ____________ 24. If that bag lost water, what type of solution must it have been in (hypertonic, hypotonic, isotonic)? Station G Show that you understand what is happening in each picture as molecules move in and out cells by match the diagrams to their type of molecular transport. Make sure that you choose the most specific answer. NOTICE which way the arrows are pointing (indicate movement). a. osmosis d. phagocytosis b. pinocytosis e. facilitated diffusion c. diffusion f. active transport 25.__________ 26.___________ 27.__________ 28.__________ 29.__________ 30. __________ Station H 31. Where are there more solute molecules in the cell (extracellular fluid or cytoplasm)? ________________ 32. Which way are the solute molecules moving (into or out of) the cell? ___________________ 33. Is this an example of passive or active transport? ______________________ 34. Does it require ATP? ____________________ Station I The diagram shows two different kinds of substances, A and B, entering a cell. 35. Does ATP have to be used to move either substance into the cell? _____ 36. If so, which substance? __________________ Why? 37. When a cell does need energy, which of its organelles produces it for the cell? _________________ Station J Describe the solutions these red blood cells must have been put in for them to now look this way. Include how you know. 38. 39. 40. Station K What types of solutions have these cells been placed in? How do you know? 41. 42. 43. 44. Station L 45. Where are the minerals the most concentrated? ______ 46. Which way are they moving? _________________ 47. How can that occur?(explain) Station M This is a picture of a paramecium. They live in fresh water but have a high solute concentration inside. 48. Osmosis means water goes from high concentrations of water to low concentrations of water. In what direction will the water go? 49. Why is the contractile vacuole important to this organism? Explain.