During transcription, the nucleotide sequence of the DNA strand that is being coded is ATACG, then the nucleotide sequence in the mRNA would be
According to the Chargaff's rule of base pairing, adenine is always paired with thymine (or uracil in case of RNA) and guanine is always paired with cytosine. Applying this rule, the mRNA sequence of ATACG would be UAUGC.