5 minutes, Go over exercises
Play-dough group exercise. (mark pens, pencils)
30 minutes, Playdough on major groove, toothpicks as basepairs. The major groove become obvious in the model.
1 hour: Lac operon. The class worked through 3 lac operon problems.
Questions can be designed for CAPbinding site or CAP or lacXYZ genes, such as frameshift. Frameshift in the one protein should not cause frame shit mutations in other genes in the same operon.