What are five functions of proteins in a human cell?
Categorized: Biology Source: Protein Function | biology.about.com Description: speed up chemical reactions. Examples include the enzymes lactase and pepsin. Lactase breaks down the sugar lactose found in milk. Pepsin is a digestive enzyme that works in the stomach to break down proteins in food. Answered: Dec 23 2009, 11:35pm Answered by: Anthony D.