instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Diffraction is the phenomenon in which light and sound waves become circular at the point source of a barrier.
answer:
What is the phenomenon in which light and sound waves become circular at the point source of a barrier?

question:
The double helix dna shape forms when the two nucleotide chains wrap around the same axis.
answer:
What distinctive dna shape forms when the two nucleotide chains wrap around the same axis?

question:
Electrophiles have a strong tendency to react with nucleophiles.
answer:
Electrophiles have a strong tendency to react with what?