Given below is a part of the template strand of a structural gene `bar("TAC CAT TAG GAT")`
(a) Write its transcribed mRNA strand with its polarity.
(b) Explain the mechanism involved in initiation of the transcription of this strand.

Explanation

Transcription of the DNAtemplate strand produces and RNAtranscript with the same sequence as the non-template or coding strand of the DNA. However, there would be uracil opposite to adenine inplace of thymine.
The sequence of mRNA-51- AUG GUAAUC CUA-3’
(b) Template strand pf DNA acts as a template for the synthesis of mRNA during transcription. It runs from 3’ to 5’ where as, the coding strand is a sequence of DNA that has the same base sequence as that of mRNA. It runs from 5’ to 3’.,
(c) The process of transcription is initiated with the help of enzyme called DNA dependant RNA polymerase in only one direction, which is 5’ 3’ direction there by initiating the process of synthesis of RNA called transcription.