What is the small,extra-chromosomal $DNA$ found in bacteria called?

Which of the following is absent in a prokaryotic cell?

An episome is a:

In $Escherichia$ $coli$,which of the following is true?

Select the correct option for the following statements:
$(i)$ The essential infoldings of the plasma membrane in bacteria are called $Mesosomes$ / $Polysomes$.
$(ii)$ The structures found in long $Gram-negative$ bacteria that help in conjugation are called $Pili$ / $Fimbriae$.

Which of the following inclusion bodies are absent in the cytoplasm of bacteria?