An experiment was set up to determine the movement of molecules through a dialysis-tubing bag into water. A dialysis-tubing bag containing 5 percent lactose and 5 percent fructose was placed in a beaker of distilled water, as illustrated in the given figure. After 4 h, fructose is detected in the distilled water outside of the dialysis-tubing bag, but lactose is not.What conclusions can be made about the movement of molecules in this experiment?
Question
An experiment was set up to determine the movement of molecules through a dialysis-tubing bag into water. A dialysis-tubing bag containing 5 percent lactose and 5 percent fructose was placed in a beaker of distilled water, as illustrated in the given figure. After 4 h, fructose is detected in the distilled water outside of the dialysis-tubing bag, but lactose is not.What conclusions can be made about the movement of molecules in this experiment?
Solution
Based on the given information, we can draw the following conclusions about the movement of molecules in this experiment:
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The presence of fructose in the distilled water outside the dialysis-tubing bag suggests that fructose molecules were able to pass through the dialysis membrane and diffuse into the water. This indicates that fructose is a smaller molecule than the pores of the dialysis membrane, allowing it to move freely.
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On the other hand, the absence of lactose in the distilled water suggests that lactose molecules were unable to pass through the dialysis membrane and diffuse into the water. This indicates that lactose is a larger molecule than the pores of the dialysis membrane, preventing it from moving across the membrane.
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The fact that only fructose was detected in the distilled water and not lactose indicates that the movement of molecules in this experiment is selective. The dialysis membrane allows smaller molecules like fructose to pass through while blocking larger molecules like lactose.
In summary, the experiment demonstrates that fructose molecules can move through the dialysis membrane and into the water, while lactose molecules cannot. This suggests that the movement of molecules in this experiment is size-dependent and selective.
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