EnYmEs?!? Please help?

Question

If there is no reaction when H2O2 is added to cows liver (an experiment) does that mean there is NO catalase in the cows liver? If there is a fast, moderate, or slow reactions, does that mean there is catalase? Please help. Im a little confused on writing my lab report. Thank you.

Answer 1

If there is no reaction when H2O2 is added then I would say it is safe to conclude that there is no catalase.  However, if a reaction (whatever the rate) occurs then it does not prove that catalase is responsible.  Other enzymes destroy H2O2 as well as catalase; namely peroxidases.