Genetic information flows from ......... to ..........

Explain (in one or two lines) the function of the following:
$(a)$ Promoter
$(b)$ $tRNA$
$(c)$ Exons

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:

The portion of a gene that is transcribed but not translated is known as:

$RNA$ splicing, capping and tailing occurs in . . . . . . of the cell.

During transcription,the site on $DNA$ where $RNA$ polymerase binds is called .......