Identify the enzyme that helps in unwinding the $DNA$ helix during transcription.

What does the given figure represent?

Which mineral element is essential for the process of transcription?

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.

The process of synthesis of $m-RNA$ from $DNA$ is called ......

Find out the correct statement about transcription $:-$