Which of the following is true about starch and iodine diffusion?     Starch was not able to diffuse through the membrane of the dialysis bag because it is positively charged. Iodine was able to diffuse through the membrane of the dialysis bag because it is negatively charged.     Starch and iodine were both not able to diffuse through the membrane of the dialysis bag because they are very large molecules.     Starch was not able to diffuse through the membrane of the dialysis bag because it is a very large polymer. Iodine was able to diffuse through the membrane of the dialysis bag because it is a small molecule.     Starch and iodine switched places in the experiment because they both moved down their concentration gradients.

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Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.