Exercise 1: Cell Transport Mechanisms and Permeability Worksheet Assignment Due: Week 2
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Activity 1: Simulating Simple diffusion
1. What is the molecular weight of Na+?
2. What is the molecular weight of Cl-?
3. Which MWCO dialysis membranes allowed both of these ions through? 4. Which materials diffused from the left beaker to the right beaker? 5. Which did not? Why?
Activity 2: Simulating Dialysis
1. What happens to the urea concentration in the left beaker (the patient)? 2. Why does this occur?
Activity 3: Facilitated Diffusion
1. At a given glucose concentration, how does the amount of time it takes to reach equilibrium change with the number of carriers used to “build” the membranes? 2. Does the diffusion rate of Na+/Cl- change with the number of receptors? 3. What is the mechanism of the Na+/Cl- transport?
4. If you put the same amount of glucose in the right beaker as in the left, would you be able to observe any diffusion? 5. Does being unable to observe diffusion necessarily mean that diffusion is not taking place?
Activity 4: Osmosis
1. Did you observe any pressure changes during the experiment? If so, in which beaker(s), and with which membranes? 2. Why?
3. Did the Na+/Cl- diffuse from the left beaker to the right beaker? If so, with which membrane(s)? 4. Why?
5. Explain the relationship between solute concentration and osmotic pressure? 6. Does diffusion allow osmotic pressure to be generated? 7. Would pressure be generated if solute concentrations were equal on both sides of the...
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