Question

Team Lactose Lab discovered that some fair volunteers can drink milk with no problems while others get stomach cramps and feel sick. They learned this difference is related to an enzyme called lactase. What type of data would be most helpful for understanding this biological difference?
Question 2 options:

Measure lactase enzyme amounts in people who can and can't digest milk properly

Test whether milk actually tastes different to different people at the fair

Count the total number of milk drinkers in different countries around the world

Ask all the volunteers detailed questions about their personal milk preferences

Answer 1

Measure lactase enzyme amounts in people who can and can't digest milk properly.

Reason: lactase activity is the biological mechanism that breaks down lactose, so comparing enzyme levels between tolerant and intolerant volunteers directly tests the cause. The other options (taste, population counts, preferences) don’t measure the underlying biology.