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

Some plants have stolons, or stems, that run along the ground and are commonly called runners.
Some plants have stolons, or stems, that run along the ground and are commonly called what?

While the numerical aperture can be used to compare resolutions of various objectives, it does not indicate how far the lens could be from the specimen.
While the numerical aperture can be used to compare resolutions of various objectives, it does not indicate how far the lens could be from the what?

They are not transcribed happens to structural genes in the presence of tryptophan.

What happens to structural genes in the presence of tryptophan?

