Function of plasma membrane extensions (mesosome) of prokaryotic cell is
\[
\begin{aligned}
\text{I.} \;& \text{Helps in cell wall formation} \\
\text{II.} \;& \text{DNA replication} \\
\text{III.} \;& \text{Secretion process} \\
\text{IV.} \;& \text{Helps in respiration}
\end{aligned}
\]
(and = all, only = only)