Lactose Enzyme Examination
Lactose is a disaccharide sugar made of galactose and glucose that is found in milk and other dairy products. It provides one of the primary sources of nutrients for infants. Some individuals are intolerant of lactose, meaning they are unable to digest lactose because they lack the enzyme lactase which breaks down lactose; this is common among Asian, African or people of Native American heritage and less common in people of northern or western European ancestry. In most situations this problem can be alleviated to some degree by taking lactase enzyme tablets. People with low lactase levels can generally consume 2-4 ounces of milk at once without causing symptoms, but larger serving sizes may cause problems.
This lab will investigate some of the properties of lactose and effect of different conditions on the sugar.
Part A: Does lactose have glucose?
Milk has the sugar lactose in it; lactose is made of glucose and galactose. (Glucose test strips will change color depending on the amount of glucose in the sample.)
Part B: Changing Conditions
Changing the environment conditions (temperature, pH, humidity, precipitation, etc.) can have an effect on organisms or the mechanisms carried out by the organism. Select one of the options below to change the condition of the experiment to evaluate what effect of changing the experimental conditions.
Option 1: Effect of Heat
Option 2: Effect of Different Sugars
 Board, A.D.A.M. Editorial. "Lactose Intolerance." Lactose Intolerance. U.S. National Library of Medicine, 18 Nov. 0000. Web. 07 Oct. 2012. <http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001321/>