Question

lactase is a protein in the digestive tract that helps break down certain sugars found in milk. what is the main function of lactase?
to provide structure
to fight disease
to maintain homeostasis
to regulate cell reactions

Explanation:

Lactase is an enzyme. Enzymes are proteins that regulate cell - reactions by acting as catalysts to speed up chemical reactions. In this case, lactase speeds up the breakdown of milk sugars in the digestive tract.

Answer:

to regulate cell reactions