The Refill contains the perishable materials needed to rerun the classroom kit. With instructions.
Intermediate - Easy to perform; requires some basic training in microbiology.
For a class of 30 students or for 6 separate teacher demonstrations. Excellent for all levels of teaching. Demonstrates the DNA extraction process of freeze-dried E. coli cells. Cell walls are broken with a detergent, and the DNA is extracted onto a spooling rod.
The exercise helps students visualize DNA and understand some of its properties. A hot water bath, test tubes, and 70 to 95% alcohol are needed but not included. Requires 1 to 2 class periods to complete.