Final answer:
In the described experiment, the movement of molecules was observed, with fructose diffusing through the dialysis bag into the deionized water, while lactose did not. This finding indicates that smaller molecules like fructose can move through the dialysis tubing, unlike larger molecules such as lactose. Tubes without a reaction confirm that the deionized water was not contaminated with starch or maltose.
Step-by-step explanation:
The experiment involving a dialysis-tubing bag containing 5% lactose and 5% fructose aimed to assess the movement of molecules through the bag. The key observation was that fructose, a monosaccharide, was found in the distilled water outside of the dialysis bag after the experiment. However, lactose, as a disaccharide, was not detected in the distilled water. This implies that fructose was able to pass through the pores of the dialysis-tubing bag due to its smaller molecular size, whereas lactose was unable to do so because of its larger molecular size. The conclusion drawn from this experiment is that smaller molecules like fructose can diffuse through dialysis tubing, while larger molecules such as lactose cannot. When considering the integrity of the deionized water used in experiments, it is essential to ensure that there is no contamination with substances such as starch or maltose, which could potentially lead to false results. To verify that the deionized water did not contain contaminating starch or maltose, no reaction (such as a color change indicating the presence of these substances) in the tubes with deionized water would indicate that the water is indeed free of these contaminants.