instruction:
In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
question:
Question: All of the land drained by a river system is called its basin, or what "wet" term? Answer: watershed
answer:
All of the land drained by a river system is called its basin, or the "wet" term  watershed


question:
Question: What is the term for the length of the route between two points? Answer: distance
answer:
Distance is the term for the length of the route between two points.


question:
Question: Which inducer turns on the expression of the lac genes? Answer: allolactose
answer:

Allolactose inducer turns on the expression of the lac genes.