$A$ specialised membranous structure in a prokaryotic cell which helps in cell wall formation,$\text{DNA}$ replication and respiration is :

Which of the following statements about a bacterial cell is/are correct?
$(i)$ Mesosome is formed by the extensions of plasma membrane into the cell.
$(ii)$ The pili are elongated tubular structures made up of a protein.
$(iii)$ Flagellum is composed of filament,hook,and basal body.
$(iv)$ Ribosomes are about $30 \; nm$ by $50 \; nm$ in size.

The membrane-less structure$(s)$ in a prokaryotic cell is/are ........

Circular $DNA$ molecule occurs in

The term 'glycocalyx' is used for

In the cytoplasm,high numbers of inclusion bodies are called........