Question

write the amino acid using its three - letter abbreviation. write stop for a stop codon.
dna sequence
mrna codon uag
amino acid
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work it out

Explanation:

Step1: Recall the DNA - mRNA base pairing rules

DNA has bases A, T, C, G and mRNA has bases A, U, C, G. The base - pairing rules are A - U and T - A (for DNA to mRNA), C - G and G - C. Given mRNA codon is UAG. To find the DNA sequence, we use the reverse of transcription base - pairing.
Since mRNA U pairs with DNA A, mRNA A pairs with DNA T, and mRNA G pairs with DNA C. So for mRNA codon UAG, the DNA sequence is ATC.

Step2: Use the genetic code table

Looking at the genetic code table, the codon UAG is a stop codon.

Answer:

DNA sequence: ATC; amino acid: STOP