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BIOLOGICAL SCIENCE 4 PRACTICAL CATALASE SUBMITTED: DAY ##TH MONTH 2004 WEIGHTING: 20% TEACHER: ANN SUTTON LINE 4 BIOLOGY 4 ANNABEL INGHAM Introduction Enzymes are biological catalysts that promote some of the thousands of chemical reactions that occur in living cells. They are large molecules that have a unique three-dimensional structure that allows it to react with a specific substrate. It is hypothesized that pH levels out of the normal range found in cells would denature the enzyme, slowing the enzyme's reaction rates. Hydrogen Peroxide (H2O2) is a poisonous chemical that is continually being formed as a byproduct of reactions in peroxisomes of living cells. Since it is poisonous, the cells must either rid themselves of it or change it to something that is not harmful to the body, the consequence of not doing so, ultimately being death. The enzyme catalase is found in animal and plant tissues, and is especially abundant in the liver. Catalase reacts with the...

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