Which of the following is a structure found in prokaryotes?

In prokaryotes,chromatophores are

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

Mesosomes are the infoldings of $..............$.

Flagella with a single strand and composed of flagellin protein are found in:

Read the following statements regarding Mesosomes:
$I -$ They are in the form of vesicles,tubules,and lamellae.
$II -$ They are formed by the extensions of the cell wall.
$III -$ They help in increasing the enzymatic content.
$IV -$ They are associated with respiration and secretory processes.
Which of the following options is correct for Mesosomes?