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

Saturated hydrocarbons hydrocarbons contain only single bonds between carbon atoms.
What hydrocarbons contain only single bonds between carbon atoms?

The values of strangeness assigned to various particles are based on decay systematics.
The values of strangeness assigned to various particles are based on what?

Pathogenic prokaryotes usually cause illness by producing poisons.

Pathogenic prokaryotes usually cause illness by producing what?