Question

If the mRNA message is AAC UAC UGC, what was the original DNA base sequence

Answer 1

TTG ATG ACG

Swap every Adenine (A) for a Thymine (T), every Uracil (U) for an Adenine, every Cytosine (C) for a Guanine (G), and every Guanine (G) for a Cytosine (C).

Answer 2

The original DNA sequence will be as given below:

3-- TTG ATG ACG--5

or

5--GCA GTA GTT--3

Explanation of answer:

The DNA sequence of the mRNA is equal to the compulsory base sequence of that RNA.

Only in RNA one nucleotide base is uracil which is present in RNA in place of thymine.

So uracil is compulsory to adenine and guanine to cytosine. while adenine is compulsory to thymine in DNA sequence.

And the direction will be 3 to 5, as mRNA was written in 5 to 3 direction.