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

All metabolic functions carried out by a prokaryote take place in the plasma membrane or cytosol else.
All metabolic functions carried out by a prokaryote take place in the plasma membrane or where else?

Some compounds form rigid frameworks called crystals.
Some compounds form rigid frameworks called what?

The visceral senses are most often below the limit of conscious perception because they are involved in this?

The visceral senses are most often below the limit of conscious perception because they are involved in this?