The Bio teacher are at it again. Today in PD Bio, students are investigating transport across cell membranes using an egg as a large cell. Concepts such as hypertonic, hypotonic, and isotonic solutions are the main focus of the activity. But, since chicken eggs are amniotic eggs, the protective white shells have to be removed keeping the cell membrane in tact. To do this, students are using vinegar to dissolve the shell so the different forms of transport can be tested.