Which of the following statements are correct with reference to the prokaryotic genome?
$A$. Monocistronic structural genes
$B$. Introns absent in structural genes
$C$. Transcription and translation are coupled processes
$D$. Primary transcript undergoes splicing
$E$. Only one $RNA$ polymerase is present

• A
  Only $A, D$ and $E$ are correct
• B
  Only $A, D$ and $E$ are not correct
• C
  Only $A, B$ and $D$ are correct
• D
  Only $B, C$ and $E$ are correct