One of the major difficulties encountered when working with enzymes is getting the reactions to work.

A good sources of experiments is:

http://www.nuffieldfoundation.org/practical-biology/factors-affecting-enzyme-activity

Insert a video of reaction - maybe use the one below and capture some raw data that could be processed and interpreted.

http://www.rsc.org/learn-chemistry/resource/res00001748/microbes-and-bread-making-using-yeast