Question

The following question refers to this table of codons.

A peptide has the sequence NH2-phe-pro-lys-gly-phe-pro-COOH. Which of the following sequences in the coding strand of the DNA could code for this peptide?
A. 5' TTT-CCC-AAA-GGG-TTT-CCC
B. 3' AUG-AAA-GGG-TTT-CCC-AAA-GGG
C. 3' UUU-CCC-AAA-GGG-UUU-CCC
D. 5' GGG-AAA-TTT-AAA-CCC-ACT-GGG
E. 5' ACT-TAC-CAT-AAA-CAT-TAC-UGA

Answer 1

The DNA sequence that could code for the given peptide sequence is option D.

Step-by-step explanation:

A student is trying to determine which DNA sequence could code for a peptide with the sequence NH2-phe-pro-lys-gly-phe-pro-COOH. To figure out the correct DNA sequence that codes for this peptide, we must find the DNA strand that corresponds to the RNA sequence that would code for the given amino acids. The mRNA sequence that would code for this peptide is 5'-UUU-CCC-AAA-GGG-UUU-CCC-3', considering UUU for phenylalanine (phe), CCC for proline (pro), AAA for lysine (lys), and GGG for glycine (gly). The DNA sequence that could code for the given peptide sequence is option D. The sequence 5' GGG-AAA-TTT-AAA-CCC-ACT-GGG 3' in the coding strand of the DNA can code for NH2-phe-pro-lys-gly-phe-pro-COOH.