This pre-lab will present some of the concepts related to the movement of materials across cell membranes and the process of osmosis.
General Purpose
The data gathered for Exercises 1 and 2 in the Movement of Materials Across the Cell Membrane I Lab will be graphed and analyzed in this lab. At the end of this lab groups will give a brief oral presentation of their findings.
Before coming to lab you should review:
Complete the following table from Exercise 1.
To calculate percent change in mass for the tissue, use the formula:
NOTE: If the disks gained mass, the values should be positive. If they lost mass, the values should be negative. Calculating percent change in mass adjusts for differences in initial masses of the different samples and allows for direct comparisons of osmotic responses among the samples.
Proceed to the Pre-Lab Quiz