The amino acid serine is coded by the mRNA codon AGU. What is the base sequence of the DNA gene that originally produced this mRNA codon? (1 point)

Question

0 TCC
O UCA
• AGU
O TCA

Answer 1

To determine the base sequence of the DNA gene that produced the mRNA codon AGU, we need to remember that the mRNA is synthesized from the DNA template strand, and the base pairing rules apply (where adenine pairs with uracil in RNA, and thymine pairs with adenine in DNA).

The codon AGU in mRNA corresponds to the complementary DNA template strand sequence.

1. The mRNA codon AGU corresponds to the DNA template strand base:
   • A (Adenine) pairs with T (Thymine)
   • G (Guanine) pairs with C (Cytosine)
   • U (Uracil in RNA is replaced with T in DNA) pairs with A (Adenine)

Therefore, the complementary DNA sequence of the mRNA codon AGU is TCA.

So, the base sequence of the DNA gene that originally produced the mRNA codon AGU is TCA.