Experiment 2: Elephant toothpaste generation via catalase in yeast (~10-20 minutes; Fig. ) While elephant toothpaste is a popular demonstration, the role of the metalloenzyme, catalase, in enabling this reaction is typically not explained. We emphasized the role of catalase as a biocatalyst by incorporating elephant toothpaste experiment in our sessions which utilizes catalase enzyme found in yeast. The catalase in yeast is 22-fold more active than that in potatoes. Additionally, when used in conjunction with dish soap that provides increased surface tension and catches the released oxygen, the yeast catalase creates an even more vigorous reaction when mixed with hydrogen peroxide.