The codon chart shown here uses the three base sequence found on the mRNA molecule after the information is copied from DNA during transcription. If the mRNA message is ACC UAC UGC, what was the original DNA base sequence?

It would be TGG ATG ACG.

Answer: The correct answer is-

The original DNA base sequence is - TGG ATG ACG.

Transcription is a process of formation of mRNA (messenger RNA) from DNA (deoxyribonucleic acid) that is transfer of genetic information from DNA to mRNA.

During this process, one strand of DNA acts as template, using which enzyme RNA polymerase synthesizes mRNA, which is complementary to the template DNA. The bases in the mRNA are added in the following manner-

For Adenine, Thymine, Cytosine, and Guanine in the template DNA, bases Uracil, Adenine, Guanine, and Cytosine respectively are added in the mRNA transcript by the enzyme RNA polymerase.

Therefore, for the given mRNA sequence ACC UAC UGC, we can deduce the original DNA base sequence, that is TGG ATG ACG.