Looking for a “Wow” from your students? The model organism Saccharomyces cerevisiae provides the drama in this study of the permeability of yeast cells and the function of the cell membrane. Using an indicator to observe which substances the cell membrane will allow, students discover that the cell membrane plays a vital role in regulating what goes into and out of the cell. The ability of substances to cross the phospholipid bilayer offers amazing visual evidence for facilitated diffusion and active versus passive transport. Kit includes reproducible student handouts, detailed background information, complete teacher notes with sample data and answers to all questions, and all chemicals and consumable supplies needed to perform the lab. Complete for 30 students working in pairs. Super Value Kit is complete for 5 classes of 30 students working in pairs.