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

Compound does the precise pattern of a crystal depend on.
What does the precise pattern of a crystal depend on?

The discovery of ribozymes nullified the idea that all biological catalysts are proteins.
What nullified the idea that all biological catalysts are proteins?

No reaction happens when alkanes are mixed with oxygen at room temperature.
What happens when alkanes are mixed with oxygen at room temperature?