Question

The following question refers to this table of codons.

A possible sequence of nucleotides in the template strand of DNA that would code for the polypeptide sequence phe-leu-ile-val would be
A. 5' TTG-CTA-CAG-TAG 3'.
B. 3' AAA-AAT-ATA-ACA 5'.
C. 3' AAA-GAA-TAA-CAA 5'.
D. 5' AUG-CTG-CAG-TAT 3'.
E 3' AAC-GAC-GUC-AUA 5'.

Answer 1

The correct sequence of nucleotides in the template strand of DNA that codes for the polypeptide sequence phe-leu-ile-val is D. 5' AUG-CTG-CAG-TAT 3'.

Step-by-step explanation:

In the DNA code, each three-nucleotide sequence, known as a codon, codes for a specific amino acid in the synthesis of a polypeptide chain. The given polypeptide sequence phe-leu-ile-val corresponds to the amino acids phenylalanine (phe), leucine (leu), isoleucine (ile), and valine (val), respectively.

Looking at the table of codons, the DNA sequence AUG codes for methionine, which is the start codon. Therefore, the sequence that codes for phe-leu-ile-val in the template strand would be the complementary sequence to the mRNA sequence, which is D. 5' AUG-CTG-CAG-TAT 3'.

Option D is the answer.