$A$ segment of $DNA$ coding for a polypeptide,the structural gene in a transcription unit is called . . . . . . .

Identification and binding of $RNA$ polymerase to the promoter sequence is a function of

Provide definitions and explanations for the following terms: Exons,Introns,Capping,and Tailing.

Which of the following statements are correct?
$(i)$ From one molecule of $\text{DNA}$,several molecules of $\text{RNA}$ can be formed.
$(ii)$ The $\text{RNA}$ forming part is known as the translational unit.
$(iii)$ The promoter is located at the $5'$ upstream end.
$(iv)$ The promoter and terminator flank the structural gene in a transcription unit.

Which enzyme helps in the process of $DNA$ transcription?

Describe the process of transcription in prokaryotes (bacteria).