instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
The discovery of ribozymes nullified the idea that all biological catalysts are proteins.
answer:
What nullified the idea that all biological catalysts are proteins?


question:
Tight junction is the term for a watertight seal between two adjacent animal cells.
answer:
What is the term for a watertight seal between two adjacent animal cells?


question:
At ocean trench location are oceans the deepest.
answer:

At which location are oceans the deepest?