A student filled one dialysis bag with 0.1 M starch solution, and | Filo
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Class 11

Biology

Cell: Structure and Functions

Cell: The Unit of Life

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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?

  1. A
  2. B
  3. C
  4. D
Correct Answer: Option(c)
Solution:
As already mentioned in the question starch is too large a molecule to pass through the dialysis membrane. Thus there will be no change in mass of the bag with 0.1 M starch with time.
Also since the concentration in the dialysis bag and the beaker is the same i.e isotonic there will be no flow of starch solution into the bag from the beaker or vice versa(both beaker and dialysis bag have 0.1 M starch solution).
 Thus the correct answer is option C.
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