The removal of introns and joining of exons is known as.......

Given below are the two statements.
Statement $I$: Only one strand in the transcription unit functions as a template and is called the antisense strand.
Statement $II$: The non-template strand of the transcription unit is called the sense strand.
In the light of the above statements,choose the correct answer from the options given below.

If the sequence of the coding strand in a transcription unit is written as follows:
$5'-ATGCATGCATGCATGCATGCATGCATGC-3'$. Write down the sequence of $mRNA$.

Heterogeneous nuclear $RNA$ $(hnRNA)$ is characterized by which of the following?

In processing of eukaryotic $hnRNA$,during protein synthesis,tailing involves . . . . . . of $RNA$.

The process of copying genetic information from one strand of $DNA$ into $RNA$ is termed as .....