GGCGTATAAA GCGACGACTG TAGACTGACG AGCCTATCCA TGGACGCGCC ATGGCCCTGT AAGCGGTGCG ATG

Question

GGCGTATAAA GCGACGACTG TAGACTGACG AGCCTATCCA TGGACGCGCC ATGGCCCTGT AAGCGGTGCG ATGCAATAAA 101 ACGCGTATCA GTCATTCAGC GTAGTCTGAT GCCAGTCGAC 121 TGC Second letter UGU1 cys UAC 5 UAA Stop UGA Stop A UUG UAG Stop UGG Trp G CCA Pro CAc His CGU CGC ACU AGU AUC lle ACC AUG Met ACG GCU AGC AAGJLys AGA GCC Ala GAA Glu GGG Thr AAC AUA GUU GUC Val GCA GUA /Val GUG GCA /Ala GACAsp GGU 1. For the eukaryotic DNA sequence shown below, where is the 3 UTR? ! No, that's not the correct answer a. 51-123 b. 59-101 c. 63-101 d. 71-81

Explanation / Answer

Option c is the correct answer. The 3' UTR (3' untranslated region) is found immediately after the termination (stop) codon in mRNA. Here the nucleotide sequence just before the 63rd nucleotide is TAA. THis TAA will become UAA in mRNA because in RNA, uracil is present instead of thymine in DNA. UAA is stop codon (as shown in table) and thus, Just after the TAA sequence that is from 63rd nucleotide The 3'UTR region begins. Hence the correct answer is c.

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