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

Ex Input:
The double helix dna shape forms when the two nucleotide chains wrap around the same axis.

Ex Output:
What distinctive dna shape forms when the two nucleotide chains wrap around the same axis?

Ex Input:
Simple kind of diffusion do small hydrophobic molecules squeeze through lipid molecules.

Ex Output:
What kind of diffusion do small hydrophobic molecules squeeze through lipid molecules?

Ex Input:
Double sugars are called disaccharides.

Ex Output:
What are double sugars called?