cell biology

Name: ______________________________
Membrane Transport pre-lab worksheet & Warm-up 5
Spring 213
View the following (best in Explorer – requires Flash animation):
Passive diffusion and definition
http://student.ccbcmd.edu/courses/bio141/lecguide/unit3/eustruct/passive_flash.htmlhttp://student.ccbcmd.edu/courses/bio141/lecguide/unit3/eustruct/passive_flash.html
Osmosis in an isotonic environment
http://student.ccbcmd.edu/courses/bio141/lecguide/unit3/eustruct/isotonic_flash.htmlhttp://student.ccbcmd.edu/courses/bio141/lecguide/unit3/eustruct/isotonic_flash.html
Osmosis in a hypotonic environment
http://student.ccbcmd.edu/courses/bio141/lecguide/unit3/eustruct/hypotonic_flash.htmlhttp://student.ccbcmd.edu/courses/bio141/lecguide/unit3/eustruct/hypotonic_flash.html
Osmosis in a hypertonic environment
http://student.ccbcmd.edu/courses/bio141/lecguide/unit3/eustruct/hypertonic_flash.htmlhttp://student.ccbcmd.edu/courses/bio141/lecguide/unit3/eustruct/hypertonic_flash.html
If for any reason those animations don’t work, try this:
http://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htmhttp://www.tvdsb.on.ca/westmin/science/sbi3a1/Cells/Osmosis.htm
In the following drawings, consider what would happen if a 0.15 M NaCl solution was placed into a bag made out of plasma membrane that allowed the passive diffusion of water (osmosis) which was then placed into a beaker with the indicated solution. For each diagram, state whether or not the solution surrounding the bag is hypertonic, isotonic, or hypotonic with respect to the bag, and then predict the direction of osmosis in each case (water into bag, water out of bag, or no net movement of water)
0.15M NaCl0.15 M NaCl0.15M NaCl1.5 M NaCl0.15M NaClPure H2O(0 M NaCl)
Solution outside bag is: Net direction of osmotic flow:
A)
B)
C)
0.15M NaCl0.15 M NaCl1.5 M O2Predict what might happen in the following situation, in which you assume that the membrane is permeable to water and to very small uncharged…

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