Final answer:
In the described experiment, fructose diffused from the dialysis tubing into the distilled water, while lactose did not, indicating pore size selectivity. The true/false question about glucose is irrelevant as glucose was not part of the described setup. In facilitated diffusion, glucose uses transport proteins to move along a concentration gradient.
Step-by-step explanation:
The experiment conducted to observe the movement of molecules through a dialysis tubing into water allows us to understand certain concepts such as diffusion, osmosis, and facilitated diffusion. In this specific experiment, glucose diffusion was not directly observed, since the initial setup includes lactose and fructose. Therefore, the initial statement - Initially, glucose was found only in the dialysis tubing - is not true or false based on the given information; it is irrelevant since glucose was not part of the initial experiment involving fructose and lactose.
Based on the experiment's result, we can conclude that fructose, a smaller monosaccharide, was able to diffuse through the semipermeable membrane of the dialysis tubing into the distilled water. However, lactose, which is a larger disaccharide, could not. This suggests that the size of the molecule can affect its ability to pass through the pores of dialysis tubing. Furthermore, in the context of facilitated diffusion, as depicted in Figure 26.8, glucose molecules can move through a cell membrane along a concentration gradient using carrier protein channels, highlighting how specific transport proteins facilitate the movement of certain molecules such as glucose into or out of cells.