-Examine the table of codons in the figure above.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?

Question

-Examine the table of codons in the figure above.A peptide has the sequence NH<sub>2</sub>-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) 3'-UUU-CCC-AAA-GGG-UUU-CCC B) 3'-AUG-AAA-GGG-TTT-CCC-AAA-GGG C) 5'-TTT-CCC-AAA-GGG-TTT-CCC D) 5'-GGG-AAA-TTT-AAA-CCC-ACT-GGG

Quizplus · Accepted Answer

The coding strand of DNA has the same sequence as the mRNA (except that in DNA, thymine (T) is used instead of uracil (U)), and the mRNA sequence is complementary to the template strand of DNA. The peptide sequence is phe-pro-lys-gly-phe-pro, which corresponds to the mRNA codons UUU-CCC-AAA-GGG-UUU-CCC. Therefore, the coding DNA strand must have the sequence 5'-TTT-CCC-AAA-GGG-TTT-CCC, which matches option C.

-Examine the Table of Codons in the Figure Above