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

Example Input: Just as salty taste involves perception of sodium ions in saliva, sweet taste correlates with presence of glucose.
Example Output: Just as salty taste involves perception of sodium ions in saliva, what taste correlates with presence of glucose?

Example Input: Rubber is an example of a(n) insulators that does not allow electrons to move through them.
Example Output: Rubber is an example of what type of substances that do not allow electrons to move through them?

Example Input: Rna is studied to understand gene expression patterns in cells.
Example Output:
What is studied to understand gene expression patterns in cells?