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Cell membrane transport lab




BK-1-Cell MembraneTransport.rtf Download Attachment;Lab Report;Name;Section;Cell Membrane Transport;Exercise 1 - Diffusion through an Artificial Membrane;Data Table 1 - Changes during Dialysis;Color;Before Dialysis;After Dialysis;Solution in Dialysis tubing;Solution in Cup 1;Data Table 2 - Benedicts test Results;Tube Contents;Color Before Heating;Color After Heating;#1 IKI solution from cup 1;#2 Dialysis bag solution from cup 2;#3 Distilled water;Questions;1. Which of the tubes #1, #2, or #3 is the control for this experiment?;2. What color change did you observe inside the dialysis tubing? What does that change;indicate?;3.;Was there a color change in the water surrounding the tubing? If so, explain.;4. What color change(in the liquid) was observed in the water containing the IKI after heating?;What does that change indicate?;1;5. Did you notice any precipitate in the tubes after heating? If so, what color was it? Which;tubes was it present in?;6. What does the Benedicts reagent detect?;7. What does the IKI solution detect?;8. Is the transport mechanism observed here passive or active? Why?;Exercise 2 Diffusion at Different Temperatures;Data Table 3 - Diffusion of KMnO4 at Various Temperatures;Temperature inside cup;Color of water;0 minutes;5 minutes;#1 Cold;#2 Ambient;#3 Hot;Questions;1. State a general hypothesis to cover how temperature affects rate of diffusion.;2. Did all of the solution in the tubes change color within 5 minutes? If so, which;tubes?;Lab Report;Name;Section;3. If you had any tubes that did not change color within 5 minutes, how much longer;would you speculate it would take to change colors? Explain your answer.;4. Do you think if the test tubes were larger and held more water the results would;be the same? Explain your answer.;5. How does temperature affect the rate of diffusion?;Exercise 3 - Tonicity and Diffusion;Data Table 4-Potato Dimensions;Tubes of Potato;Potato Weight;Before Osmosis;(grams);Potato Weight;After Osmosis;(grams);Weight Change;(grams);#1 Distilled water;#2 10% Sodium;Chloride;Using the information from Data Table 4, fill in the following chart. Describe the tonicity;for the potato cells compared to each tube solution and describe the tonicity of the tube solutions;compared to the potato cells. Which is isotonic, hypertonic, or hypotonic and how did the water;move? (into the cell, our of the cells, no water movement);Tubes of Potato;Hypotonic, Hypertonic, or Isotonic;Potato;Tube contents;3;Describe the movement;of water;#1;#2;Questions;1. What is the condition of each potato strip after soaking in the test tubes for an;hour? Which one is limp and which one is crisp?;2. How would you explain the difference in the conditions of the potato strips using;the concept of tonicity?;3. How do the changes in the conditions of the potato strips relate to the wilting of;plants?


Paper#18066 | Written in 18-Jul-2015

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