To determine the DNA base sequence that would produce the mRNA codon AGU, we first need to consider the process of transcription. In transcription, the DNA template strand is used to synthesize mRNA, where adenine (A) pairs with uracil (U) in RNA, thymine (T) pairs with adenine (A), cytosine (C) pairs with guanine (G), and guanine (G) pairs with cytosine (C).
The mRNA codon AGU corresponds to the following DNA template strand:
- A (adenine) in mRNA pairs with T (thymine) in DNA
- G (guanine) in mRNA pairs with C (cytosine) in DNA
- U (uracil) in mRNA pairs with A (adenine) in DNA
Thus, the DNA template strand that corresponds to the mRNA codon AGU is:
- A → T
- G → C
- U (considering U as T in DNA) → A
So the base sequence of the DNA gene would be:
TCA
Therefore, the correct response is:
TCA