Exercise 1

Topics: Diffusion, Osmosis, Molecular diffusion, Concentration / Pages: 3 (694 words) / Published: Nov 8th, 2012
Activity 1:
1. Did any solutes move through the 20 MWCO membrane? Why or Why not?
2. Did Na+Cl- move through the 50 MWCO membrane?

Activity 2:
1. Are the solutes moving with or against their concentration gradient in facilitated diffusion?
2. What happened to the rate of facilitated diffusion when the number of carrier proteins was increased?
3. In the simulation you added Na+Cl- to test its effect on glucose diffusion. Explain why there was no effect.

Activity 3:
1. Which membrane resulted in the greatest pressure with Na+Cl- as the solute? Why?
2. Explain what happens to the osmotic pressure with increasing solute concentration.
3. If the solutes are allowed to diffuse, is osmotic pressure generated?
4. If the solute concentrations are equal, is osmotic pressure generated? Why or Why not?

Activity 5:
1. In the initial trial the number of Na+ -K+ pumps is set to 500, the Na+Cl- concentration is set to 9.00mM, the K+Cl- concentration is set to 6.00mM, and the ATP concentration is set to 1.00mM. Explain what happened and why. What would happen if no ATP had been dispensed?
2. Why was there no transport when you dispensed only Na+Cl-, even though ATP was present?
3. What happens to the rate of transport of Na+ and K+ when you increase the number of Na+ -K+ pumps?
4. Explain why the Na+ and K+ transports were inaffected by the addition of glucose.

Exercise 1: Cell Transport Mechanisms and Permeability:
Activity 1: Simulating Dialysis (Simple Diffusion) Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly.
1. The driving force for diffusion is You correctly answered: b. the kinetic energy of the molecules in motion.
2. In diffusion, molecules move You correctly answered: a. from high concentration to low concentration.
3. Which of the following dialysis membranes has the largest pore size? You correctly answered: d. 200 MWCO
4. Avogadro's number is a constant for the number of You correctly

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