Review Sheet 2

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  • Topic: Diffusion, Kidney, Osmosis
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REVIEW SHEET
EXERCISE 1
Cell Transport Mechanisms and Permeability

NAME:
LAB TIME/DATE:
Simple Diffusion
1. The following refer to Activity 1: Simulating Dialysis (Simple Diffusion). Which solute(s) were able to pass through the 20 MWCO membrane? None of the solutes were able to pass through the 20 MWCO membrane. A possible reason to why none of the of these solutes were able to pass through was because the solutes could have been too big to be transported.

According to your results, which solute had the highest molecular weight? The solute that had the highest molecular weight was Albumin. Which solute displayed the highest rate of diffusion through the 200 MWCO membrane? The solute that displayed the highest rate of diffusion through the 200 MWCO membrane was NaCl. Using the data from Chart 1, explain the relationship between the rate of diffusion and the size of the solute. The smaller the solute particle, the greater the rate of diffusion.

Facilitated Diffusion
2. The following refer to Activity 2: Simulating Facilitated Diffusion. Did any of the substances travel against their concentration gradient? Explain why or why not. No, none of the substances travel against their concentration gradient. In facilitated diffusion, substances can move only down their concentration gradient.

Using your results from Chart 2, what was the fastest rate of facilitated diffusion recorded? The fastest rate of facilitated diffusion recorded was 0.0038 Describe the conditions that were used to achieve this rate. 8mM glucose with 900 glucose carriers in the membrane.

Name two ways to increase the rate of glucose transport.
Two ways to increase the rate of glucose transport is to increase the amount of glucose in solution and to increase the number of glucose carriers in the membrane.

Did NaCl affect glucose transport?
No
Did NaCl require a transport protein for diffusion? Why or why not? No because of its small size NaCl is able to diffuse down its...
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