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3. In order to determine the best concentration of solutes to give a patient in need of fluids I would determine the water potential of the blood. 4. You can use weights of the filled cell models to determine the rate and direction of diffusion by weighing the models before and after diffusion took place. The control would be the water inside and outside the cell. 5. You could determine the rates and directions of diffusion of water, sucrose, NaCl, glucose, and ovalbumin by measuring the ratios of each substance and seeing how they changed over time. 6. Protein is too large to diffuse. Protein does alter the diffusion rate of other molecules because it alters osmolarity. 7. The pair(s) tested that didn’t have a change in weight was the control group, which was the water, did not diffuse. 8. When comparing a 1 M solution of NaCl and a 1 M solution of sucrose, we found that Adriann Lausen Demi Dobbin AP Bio # 3 Mrs. Houseman 20 September 2019
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NaCl is more hypertonic than sucrose because it has more solute particles. NaCl is the most hypertonic solution followed by glucose.The protein solution has a low molarity, because proteins are huge meaning they don’t dissolve very much. 9. You can test for the diffusion of glucose by putting it into a dialysis tubing bag and placing it in a cup of water. 10. Based on what we learned from the experiments, you can determine the solute concentration inside a living cell by placing a cell in a solution and measure the delta mass. 11. The factors that determine the rate and direction of osmosis are steepness of the gradient, permeability of the membrane, and electrical gradient. 12. If you used a starch solution instead of a protein, you could predict that the percent difference would be larger because with a starch solution the water would actually be able to diffuse unlike a protein which is too big for diffusion to happen. 13. Yes, you can diagram the flow of water based upon the observations. 14. The net osmosis rate will reach zero when the substance diffusing has reached equilibrium. The net osmosis rate will truly equal 0 when the solute concentration inside and out is equal.Based upon our observations, we can predict the direction of osmosis in living cells when the cells are placed in various solutions. 15. The dialysis tubing is functionally different from a cellular membrane because The tubing only allows for passive transport while the cellular membrane uses active transport. Procedure 3 1. If you applied saltwater to the roots of a plant it would draw out water already inside the plant causing it to become dehydrated and die. 2. Two different ways plants control rigor pressure is through osmosis and the semipermeable membrane. 3. If the cell has a higher water potential than its surrounding environment then water will move out of the plant cell.
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