Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[EX Q]: Hybridization model model helps explain molecules with double or triple bonds.
[EX A]: Which model helps explain molecules with double or triple bonds?

[EX Q]: The discovery of ribozymes nullified the idea that all biological catalysts are proteins.
[EX A]: What nullified the idea that all biological catalysts are proteins?

[EX Q]: A(n) operon consists of one or more genes that encode the proteins needed for a specific function.
[EX A]:
Which region of dna consists of one or more genes that encode the proteins needed for a specific function?