Dialysis tubing is a selectively permeable membrane that can be filled with a solution to simulate a cell-- assume only water can move in or out of the cell. A piece of dialysis tubing has been filled with a cloudy white solution of 5 percent egg protein dissolved in water to simulate a cell. This simulated cell is weighed and then placed in a beaker of water. After soaking in the water for one hour, the simulated cell is once again weighed. Where is the hypotonic solution? water beaker O simulated cell O neither, both environments are isotonic