The bacterial flagella are composed of .......

The cells which do not contain a nucleus and mitochondria are known as

An episome is a:

The genetic material of a prokaryotic cell is known as

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 number of chromosomes in bacterial cells is $1-3$ and they are ..........