To find the DNA sequence that corresponds to the mRNA codon AGU, we need to consider the process of transcription. The codon AGU is made up of RNA bases, and we determine the DNA sequence by considering the complementary bases and the fact that RNA is synthesized from the DNA template strand.
In mRNA, the base pairs are:
- A (adenine) pairs with T (thymine) in DNA.
- U (uracil) in RNA pairs with A (adenine) in DNA.
- G (guanine) pairs with C (cytosine) in DNA.
- C (cytosine) pairs with G (guanine) in DNA.
For the mRNA codon AGU, we can translate it back to DNA as follows:
- A (from mRNA) -> T (in DNA)
- G (from mRNA) -> C (in DNA)
- U (from mRNA) -> A (in DNA)
So, the DNA sequence that codes for AGU is TAC.
Since this is a codon in the mRNA, the corresponding sequence would be found on the template strand of the DNA. The strand that is complementary to the mRNA (which is often referred to as the coding strand) would instead directly match the mRNA but using T instead of U.
Thus, for the mRNA codon AGU, the DNA coding strand would read ACT.
The sequence provided in your options includes "AGU AGU UCA UCA TCC TCC TCA". It represents codons in their mRNA form rather than DNA. If the instructions align with the need for the opposing DNA strand-derived sequence, it would be ACT.
However, from your options, none of them are strictly DNA sequences but rather are a repetition of the AGU mRNA or its possible context. To specify the original question directly:
- The base sequence of the DNA gene that originally produced AGU would be ACT in the coding (non-template) strand of the DNA.
None of the options you listed correspond to the DNA coding strand directly. If you are looking for a selection, please clarify if you have additional options or if a specific answer is sought.