A student filled one dialysis bag with 0.1 M starch solution, and a second bag was filled with distilled water. The bags were then placed in separate beakers of 0.1 M starch solution. Dialysis bags model the selective permeability of cell membranes and allow very small molecules, ions and water to pass through according to the surrounding concentration gradient.
Starch is too large a molecule to pass through the dialysis membrane. The student massed the bags every 5 minutes to monitor the amount of mass gained or lost by each bag over the course of 30 minutes. The percent change in mass for each bag was calculated and the data were plotted in the graph:
Which line on the graph would the student have obtained with the data from the bag containing a 0.1 M starch solution?