In eukaryotic cell transcription,$RNA$ splicing and $RNA$ capping take place inside the

The enzyme responsible for transcription is .....

During transcription,the holoenzyme $RNA$ polymerase binds to the $DNA$ strand,and the $DNA$ forms a saddle-like structure at that site. What is this sequence called?

What does the given figure represent?

Choose the correct statement.

$A$ gene that contains many exons and at least one intron is called a.....