
Some bacteria carry built-in compasses
Certain magnetotactic bacteria contain a membrane-bound structure called the magnetosome. That is unusual in prokaryotes, which usually lack such internal compartments.Cells: The Surprising Inner Compartments of Bacteria

Prokaryotes are not just empty bags
Some bacteria also have compartment-like structures such as gas vesicles and carboxysomes, plus tiny containers called encapsulins. Their insides can be more organized than the usual simple-cell stereotype suggests.Cells: The Surprising Inner Compartments of Bacteria