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

Example Input: The long bone work as lever.
Example Output: What type of function does the long bone perform?

Example Input: In their processes of gene expression, archael cells seukaryotic similarties to both bacterial cells and which other type of cell.
Example Output: In their processes of gene expression, archael cells show similarties to both bacterial cells and which other type of cell?

Example Input: A metallic bond is the force of attraction between a positive metal ion and valence electrons.
Example Output:
What is the force of attraction between a positive metal ion and valence electrons?