Which of the following enzymes can form $RNA$ from $DNA$?

Removal of $RNA$ polymerase $I$ from nucleoplasm will affect the synthesis of

What do the processes $1$ and $2$ represent in the following sequence?
$TAC \, AAG \, GCG \, AUA \, CGA$
$\downarrow (1)$
$AUG \, UUC \, CGC \, UAU \, GCU$
$\downarrow (2)$
$Met - Phe - Arg - Tyr - Ala$

Which structure is responsible for the synthesis of $m-RNA$?

What is absent in mature $RNA$?

Define/Explain: $A$ promoter and the structural gene.