After this lab you should be able to:
- Define osmosis, hypertonic, hypotonic, and isotonic.
- Analyze scenarios with regard to net water movement in and out of a cell and discuss the effect of osmotic pressure on microorganisms.
- Classify organisms based on their salinity preferences.
Gather the family/friends/roommates around and try this at home:
Place a piece of lettuce in a bowl of super salty water. Let is sit for a half hour or so. Prediction? Observations? Next, place the same piece of lettuce in a bowl of plain tap water. Let it sit again—this may take a bit longer. Prediction? Observations?
Try to explain what happened, or (should you be out of lettuce) what you think would happen.
Contributors and Attributions
Kelly C. Burke (College of the Canyons)