Mesosome in a bacterial cell is

Naked $DNA$ is that which 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.

Intracellular compartments are not found in cells of

In prokaryotes,which layer is the second layer of the cell envelope?

In a prokaryotic cell,the production of extracellular polymers is $NOT$ carried out by which of the following?