Explain how lactase has been used to assist people with lactose intolerance.
The enzyme lactase has been attached to a large molecule and brought into contact with the food, e.g. milk containing lactose. The lactase breaks the lactose down into glucose and galactose. People with lactose intolerance do not suffer the same effects. If they consume glucose or galactose and thus can consume milk, cheese, ice cream and other dairy products.