In some bacteria,the outer layer is a loose layer,which is known as........

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 is the smallest cell?

The average weight of a bacterium is approximately:

In many bacteria,the cell membrane becomes invaginated and folded to form:

Which of the following is not a characteristic of prokaryotic cells?