ACTIVITY 1: Simulating Dialysis (Simple Diffusion)
The molecular weight of urea is approximately 60. Which of the membranes can it pass through? a.
50 MWCO membrane
100 MWCO membrane
200 MWCO membrane
Both the 100 and 200 MWCO membranes
D. Both the 100 and 200 MWCO membranes 2.
True or False: A solution containing glucose will diffuse faster through a 200 MWCO membrane if it is heated.
The molecular weight of carbon C is 12; the molecular weight of hydrogen (H) is 1; the molecular weight of oxygen (O) is 16. The chemical formula of glucose is: C6H12O6 . Using some simple multiplication and addition, determine the molecular weight of one molecule of glucose.
Describe two variables that affect the rate of diffusion.
Why do you think that the urea was not able to diffuse through the 20 MWCO membrane?
Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane.
Put the following in order from smallest to largest molecular weight: glucose, sodium chloride, albumin, and urea.
ACTIVITY 2: Simulated Facilitated Diffusion
True or False: The facilitated diffusion of glucose requires energy from ATP.
Which of the following might cause the facilitated diffusion of glucose from one solution to another to occur faster? a.
Add Na+Cl- to the beaker on the left.
Add K+Cl- to the beaker on the left.
Add ATP to the beaker on the left.
None of these would cause it to happen faster.
True or False: If there are a sufficient large number of transport proteins present, glucose can be transported from a solution of lower concentration to a solution of higher concentration (i.e. up its concentration gradient.)
Explain one way in which facilitated diffusion is the same as simple diffusion; one way in which it is different.
The larger value obtained when more glucose carriers were present corresponds to an increase in the rate...
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