Developed by Charles G. Fleming and Ann M. Kleinschmidt (cfleming@alleg.edu, akleinsc@alleg.edu), Allegheny College, Meadville, PA 16335.
Discipline: Biology
This application contains two parts, one devoted to a simulation of diffusion and the other to a simulation of osmosis. The diffusion simulation presents a petri dish with four wells containing four chemical solutions. When the two appropriate ions come together, a line appears. Students then measure the distance each of the ions travelled. The students record this information, then use it to calculate the expected ratios of diffusion rates. In the osmosis simulation, they are given an image of two vessels separated by selectively permeable membrane that allows diffusion of water, but not sucrose. Students can control the concentration of sucrose in both vessels. They repeat the simulation several times, varying the concentration of sucrose. The students are asked to pose a hypothesis regarding direction and rate of movement of water depending upon the sucrose concentrations on either side of the selectively permeable membrane.
Bio210Lab3 is used as a pre-lab exercise for Introductory Biology at Allegheny College.
This application was developed under NeXTstep release 2.0.
