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A: The enzymes that break down protein include trypsin, chymotrypsin, pepsin, thermolysin, glutamyl endopeptidase, elastase, bromelain and papain. Trypsin, pepsin, elastase, thermolysin, glutamyl, endopeptidase and chymotrypsin are made in the human body. Bromelain comes from pineapples and papain comes from papayas.
Enzyme Functions and Denaturation. An enzyme is a biological protein molecule made up of thousands of amino acids. Enzymes have specific functions in the body, such as working to break down food or causing other chemical processes. Enzymes never die, but they are not considered to be either living or nonliving organisms.