MAAP Science Grade 8 Practice Questions - MAAP Science - Grade 8 Exam

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A dialysis tubing bag filled with a starch solution is placed into a beaker of iodine solution. After 30 minutes, the solution inside the bag turns dark blue-purple, while the liquid in the beaker remains amber. Which property of the cell membrane model does the dialysis tubing demonstrate?

Active transport requiring cellular ATP Complete impermeability to all dissolved solutes Total permeability allowing molecules of all sizes to pass freely Selective permeability based on molecular size

Correct Answer:

Selective permeability based on molecular size

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