In photosynthetic bacteria,pigments are present in ..........

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.

In bacteria,the mesosome is a specialized structure formed by the invagination of which component?

Prokaryotic flagella possess

In bacterial cells,the number of chromosomes ranges from $1-3$ and they are:

The part of the appendage that extends into the cytoplasm is: