What does the given figure represent?

During transcription,the holoenzyme $RNA$ polymerase binds to the $DNA$ strand. It forms a structure resembling a saddle at a specific site on the $DNA$. This sequence is called .....

The determination of the template and coding strands is defined by the presence of which of the following?

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Splicing	$(1)$ Contains only exons
$(b)$ Capping	$(2)$ Addition of adenylate residues
$(c)$ Tailing	$(3)$ Removal of introns
$(d)$ $mRNA$	$(4)$ Addition of methyl guanosine triphosphate

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.

In eukaryotes,$mRNA$ is synthesized with the aid of