$PPLO$ stands for ...

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 $Pili$ / $Fimbriae$.

The figure below shows a dividing bacterium. Label $P, Q$ and $R$.

In a prokaryotic cell,identify the correct sequence of layers from the outside to the inside.

Pinocytosis and phagocytosis are absent in

Which type of cell lacks a membrane-bound nucleus?