Review Sheet 1

Topics: Diffusion, Kidney, Molecular diffusion Pages: 3 (667 words) Published: April 26, 2011
Cell Transport Mechanisms and Permeability

Simple Diffusion
The following refer to Activity 1: Simulating Dialysis (Simple Diffusion).

Which solute(s) were able to pass through the 20 MWCO membrane? NONE

1.According to your results, which solute had the highest molecular weight? Albumin

2.Which solute displayed the highest rate of diffusion through the 200 MWCO membrane? Na+Cl

3.Using the data from Chart 1, explain the relationship between the rate of diffusion and the size of the solute. The larger the solute the smaller the rate of diffusion

Facilitated Diffusion
The following refer to Activity 2: Simulating Facilitated Diffusion.
4.Did any of the substances travel against their concentration gradient? Explain why or why not. No, because in a facilitated diffusion substance can only move down their concentration gradient

5.Using your results from Chart 2, what was the fastest rate of facilitated diffusion recorded? 0.0039

6.Describe the conditions that were used to achieve this rate. Glucose concentration was 8mM, glucose carriers were 900

7.Name two ways to increase the rate of glucose transport. 1)Higher number of glucose carriers
2)Higher amount of glucose in solution

8.Did NaCl affect glucose transport?

9.Did NaCl require a transport protein for diffusion? Why or why not? No, NaCl can diffuse down its concentration gradient, due to its small siz3

Osmotic Pressure
The following refer to Activity 3: Simulating Osmotic Pressure.
10.For NaCl, which MWCO membrane(s) provided for the net movement of water without movement of NaCl? 20 MWCO

11.Explain how you determined this. (Hint: Correlate your results to the data in Chart 3.) Build up of osmotic pressure, die to the presence of none diffusible NaCl in the solution is what causes water to diffuse down its concentration gradient

12.For glucose, which MWCO membrane(s) provided for the net movement of...
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