3.For each of the dialysis tubing pieces, identify whether the solution inside was hypotonic, hypertonic, or isotonic in comparison to the beaker solution it was placed in. 4.Did your weight change calculations support your hypothesis and your predictions for each dialysis bag? Why or why not?
5.From your results, which of your “unknown” solutions appears to contain more sugar(+ other unknown solutes)? Do your “unknown” sugar solutions contain more or less sugar (+ other unknown solutes) than the 3%, 15% and 30% sucrose solutions? Why? 6.What characteristics of your “unknown” solutions besides sugar content might impact the amount of swelling (or lack of swelling) in your dialysis bags containing these solutions? How might this impact your conclusions about the amount of sugar present in your “unknown”? 7.Cells exchange many substances with their environments using simple diffusion through the lipid bilayer. Describe the properties of the lipid bilayer and what properties block simple diffusion (via passive transport). Why is simple diffusion through the lipid bilayer not sufficient for all substances? Provide examples of two such substances. 8.A concentration gradient affects the direction that solutes diffuse. Briefly describe how molecules diffuse with respect to concentration. 9.What family of proteins facilitates the movement of water across the cell plasma membrane? Briefly describe the structure of these proteins and relate this structure to their function.
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