instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Ribosomes are the only organelles that prokaryotic cells have.
answer:
What are the only organelles that prokaryotic cells have?

question:
Glycerol is a triol, an alcohol which contains three hydroxl functional groups.
answer:
Glycerol is a triol, an alcohol which contains three what?

question:
Reabsorption are valuable metabolites recovered.
answer:
How are valuable metabolites recovered?