Enzyme

Definition: any substance produced by a living organism that cause a specific biochemical reaction

Connection: Dairy products all contain enzymes that can be found in the cow the milk used to create the product came from. Some enzymes that can be found in milk are lipases (which breakdown fat), professes (breaks down protein) and lactoperoxidase which turns into a type of bacteria when mixed with another substance found in milk. 

Sources Cited

Milk Facts." Milk Enzymes. Milk Facts, n.d. Web. 15 Aug. 2013. <http://www.milkfacts.info/Milk Composition/Enzymes.htm>.