People that are lactose intolerant have a functional copy of the lactase gene but are unable to digest lactose. Which statement must be TRUE about lactose-intolerant people?
A)They have the same lactase gene as lactose-tolerant people.
B)They produce a lactase enzyme but it does not fold properly.
C)They have a lactase gene made of RNA instead of DNA.
D)They produce a lactase enzyme that digests glucose instead of lactose.

Question

Quizplus · Accepted Answer

Lactose-intolerant people have the same lactase gene as lactose-tolerant people, but the gene is not expressed or is expressed at lower levels, leading to insufficient lactase enzyme production.

People That Are Lactose Intolerant Have a Functional Copy of the Lactase