An enzyme is active in the stomach of an animal but quickly loses its activity when it leaves the stomach.This example illustrates that enzymes are

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The fact that the enzyme is active in the stomach but quickly loses its activity when it leaves the stomach suggests that it is sensitive to changes in pH. The pH in the stomach is much more acidic than in the rest of the digestive system, and enzymes that function there are adapted to work at that acidic pH. As food moves into the small intestine, the pH becomes more basic and these enzymes become less effective and eventually become denatured.

An Enzyme Is Active in the Stomach of an Animal