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Science presenter Jon Chase demonstrates the action of the enzyme catalase, produced by the liver, in breaking down hydrogen peroxide into water and oxygen. The balanced equation for this reaction is shown. Jon describes the role of an enzyme’s active site.
This clip is from:
First broadcast:
11 May 2012

Classroom Ideas

Ask students to place a small amount of bread under their tongue for a few minutes. When they then move the soggy bread across their tongue it will taste sweet. This is because the enzymes in saliva break down the starch into glucose.
Show students a graphic representation of the lock and key hypothesis of how an enzyme works. Ask them to draw sequential steps of this process in the corners of their exercise book pages and flick them to make an animated diagram.