Given a scientific passage and an answer, generate a question for the given answer.

[EX Q]: Passage: Regulation of transcription in prokaryotes typically involves operons. An operon is a region of DNA that consists of one or more genes that encode the proteins needed for a specific function. The operon also includes a promoter and an operator. The operator is a region of the operon where regulatory proteins bind. It is located near the promoter and helps regulate transcription of the operon genes. Answer: operon
[EX A]: Which region of dna consists of one or more genes that encode the proteins needed for a specific function?

[EX Q]: Passage: The placenta allows nutrients and wastes to be exchanged between the mother and fetus. The fetus is connected to the placenta through the umbilical cord. Answer: umbilical cord
[EX A]: What connects the fetus to the placenta?

[EX Q]: Passage: The pressure of a gas in a gas mixture is termed the partial pressure. Answer: partial pressure
[EX A]:
What is the pressure of gas in a gas mixture termed?