a lipid that coats lactose molecules an ability to produce lactose internally an enzyme that catalyzes lactose breakdown a tolerance to lactose developed during childhood
Some individuals are unable to digest the lactose found in the milk of cows. The digestive systems of these individuals most likely lack which?

Options:
- a lipid that coats lactose molecules
- an ability to produce lactose internally
- an enzyme that catalyzes lactose breakdown
- a tolerance to lactose developed during childhood

an enzyme that catalyzes lactose breakdown