|MadSci Network: Biochemistry|
Elsie, In answer to the first part of your question, there should be no difference between catalase obtained from animal and plant sources. The reaction catalysed is the same in both instances, that is the decomposition of hydrogen peroxide into oxygen gas and water. The answer to your second part is a bit trickier. Certainly, in animal tissue, one would expect the liver to be the best source of catalase activity as it is the primary metabolic site in the body. In plant cells, storage organs are high in catalase activity, so the potato is likely to have the highest activity of the plant tissues, but would not produce as much as the liver. If you do the experiment, you find that liver will produce by far the most gas, especially if it is ground up. Boiling any of the samples will reduce the activity to almost zero as the enzymes are denatured at high temperatures. Hope this is of some help DrJim
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