Semipermeable Membrane Lab Report

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Yes, the water diffused into the cell through the semipermeable membrane. The water went through osmosis and across the semipermeable membrane because there was a gradient between the cell and the water,and they wanted to get equilibrium. So the water got into the cell for balancing the concentration. Also, the size of the water molecule was small enough to pass through the membrane. If it was not small enough, it would not be possible to pass the membrane without transport proteins. But the membrane was just a dialysis tubing, it did not have transport protein, which meant that the water molecule was small enough to across the membrane by itself. When the water got into the cell, then there were no room for the water, so the water pushed out of the cell and onto the paper towel. We could see it because the water level dropped from the point marked by an elastic. There had to…show more content…
The gradient and the size of the molecule were the only ones that affected a molecule could pass a membrane or not. If there was not a gradient, there should be some iodine in the cell. But it was not possible, we did not put anything in the cell except the starch and the amylase. If the size of the molecule was too big, the molecule needed transport protein to help it pass through the membrane, but the membrane was just a dialysis tubing, and it did not have transport protein. Also, according to the effect of the activity, the starch inside the cell had turned into navy blue. This was a proof of the iodine diffusing into the cell because iodine could react with starch chemically by changing color. If the iodine did not diffuse into the cell, there should not be any change to the starch, which meant that the starch had turned into navy blue because the iodine diffused into the
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