Essay about Cell Membranes and Transport

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Cell Membranes and Transport
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Exercise 1: Diffusion


Data Table 1: Rate of diffusion in different temperatures | | ºC | Minutes | Temperature | InitialTemp. | InitialColor | 5 | 10 | 15 | 20 | 25 | 30 | 60 | Cold | 10°celsius | clear | clear | clear | clear | clear | clear | light purple | light purple | Ambient | 25°celsius | clear | clear | clear | clear | light purple | light purple | med purple | med purple | Hot | 75°celsius | clear | purple | purple | purple | purple | dark purple | dark purple | dark purple |


A. Write a one-paragraph
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Identify which of the solutions were isotonic, hypertonic, and hypotonic in relation to the potato.

- The potatoes in the distilled water and 0.2 sucrose were the most rigid and did not change in mass. These solutions could be said to be isotonic. The potatoes in 0.8 and 0.6 could se said to be less turgid and was placed in a hypertonic solution.

B. What would happen to a red blood cell placed in distilled water? Why?

- If a RBC were placed in distilled water, which is a hypotonic solution, it would explode. This is because water would rush into the cell causing it to swell and thus cause it to explode.

C. Create a graph of your experimental data by plotting the percent change in potato mass against sucrose molarity. Label the x-axis as “Molarity of Sucrose,” and the y-axis as “% Change in Mass.”

D. Determine the molar concentration of the sucrose contained in the potato strips by using the graph created in Question C. At the point where the molar concentration of the sucrose in the potato would be isotonic to the sucrose, there would be no net change in the potato mass. On the graph this is located at the 0% change. Draw a line from this place on the y-axis to intersect the line. From the line draw a line down to the x-axis to find the molarity.

Molar concentration of sucrose in potato = 0.8 M

Exercise 3: The Effect of Solvents on Membrane

Data Table 3: Color
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