Which enzyme helps in the process of $DNA$ transcription?

What is absent in mature $RNA$?

Find out the incorrect statement.

Match the following columns:

Column-$I$ (Enzyme)	Column-$II$ (Product)
$P$. $RNA$ polymerase-$I$	$I$. $rRNA$ $(18S, 28S, 5.8S)$
$Q$. $RNA$ polymerase-$II$	$II$. $tRNA, 5S rRNA, snRNAs$
$R$. $RNA$ polymerase-$III$	$III$. $hnRNA$

The enzyme responsible for transcription is .....

Which of the following are the post-transcriptional events in an eukaryotic cell?
$A.$ Transport of pre-mRNA to cytoplasm prior to splicing.
$B.$ Removal of introns and joining of exons.
$C.$ Addition of methyl group at $5$' end of hnRNA.
$D.$ Addition of adenine residues at $3$' end of hnRNA.
$E.$ Base pairing of two complementary RNAs.
Choose the correct answer from the options given below: