Write a note on ribosomes in a prokaryotic cell.

(N/A) $\Rightarrow$ Ribosomes of prokaryotes are associated with the plasma membrane of the cell.
$\Rightarrow$ They are about $15 \ nm$ by $20 \ nm$ in size and are made up of two subunits,$50 \ S$ and $30 \ S$,which when present together form $70 \ S$ prokaryotic ribosomes.
$\Rightarrow$ Several ribosomes may attach to a single $mRNA$ molecule and form a chain called polyribosomes or polysomes.
$\Rightarrow$ Ribosomes are the site of protein synthesis.