•What does this tell you about the relative tonicitybetween the contents of the tubing and the solution in the beaker?This shows that the cell membrane will try to maintain the same person inboth inside and outside the cell in order to maintain balance.The cellmembrane will let in or out the water from and to the cell in order toequalize pressure so the cell survives.•What would happen if the tubing with the yellow rubberband was placed in a beaker of distilled water? •Suppose you had a 90% sucrose solution in one of thebeakers instead of a 3% sucrose solution. How might this change yourresults?•Describe the similarities and differences between thedialysis bag and a cell membrane. Be specific.Like the plasma membrane, dialysis tubing is a type of selectively permeable membrane. Microscopic holes, or pores, in the dialysis tubing allow substances to be separated on the basis of their size. Molecules smaller than the pores pass freely across the tubing while larger molecules are trapped inside (or outside).
•If you want water to flow out of a dialysis bag filled with a 50%sucrose solution, what would the minimum concentration of thebeaker solution need to be?The answer is; 51% sucrose solution. The solution in the beaker has to behypertonic to that in the dialysis bag for water to move from the bag into thebeaker. This is guided by the principles of osmosis where water flows fromthe hypotonic solution to the hypertonic solution through a semipermeablemembrane.
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- Fall '19
- Osmosis, Semipermeable membrane, dialysis bag