Science Experiments

Question: Why was there boiled liver in our digestion experiment in science?

In science, we did an experiment on enzymes, we where given 3 boiling tubes with H2O2 in them and a few drops of washing up liquid, we were instructed to put a small piece of raw liver in one boiling tube, one small piece of boiled liver in a boiling tube, and a small piece of carrot into the last, we then had to observe for 5 minutes or so and measure how tall the bubbles were in each tube, the raw liver got the tallest bubbles, But then our teacher asked us all why there was boiled liver in this experiment, and know one could answer.

So i was wondering, why is there boiled liver in our experiment?

Answer: raw liver has catalase ,which degrades H2O2 to form oxygen(the bubbles you see)
the boiled liver serves as a control,the catalase has denatured,so no bubbles.
carrots also have catalase.you would also get the same result with crushed beans.

!!Peristalsis!!