life science-week 4
Students prepared for and took a Cell Test. Then students did a diffusion lab involving dialysis tubing that is permeable to iodine but not starch. Iodine turns purple in the presence of starch so they can quickly see that only iodine diffuses across the selectively permeable membrane. Next week they will do a lab involving different sized agar cubes and determine what limits cells from being larger than they are.