Question

How did the DNA sequence AATCGA be transcribed to mRNA

Answer 1

UUAGCU in mRNA U-T and C-G

Answer 2

The DNA sequence AATCGA would be transcribed on mRNA as UUAGCU.

Transcription is the process of copying DNA genetic code  onto messenger RNA for the purpose of providing  the information needed for synthesis of a particular protein in the cell.  Transcription takes place in the nucleus of the cell with help of an enzyme called  RNA polymerase.

in the process, the nucleotide  guanine will always code for cytosine on the mRNA,  and adenine will always code for uracil. In RNA,  the nucleotide thymine is replaced with uracil. Thymine is therefore never found in RNA but only in DNA.  This happens according to base pairing rule.