The UTRs are some additional sequences present on mRNA which do not undergo translation. These sequences are present at:

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After start codon 5’ end only

After start codon at 5’ end and before stop codon at 3’ end.

Before start codon at 5’ end and after stop codon at 3’ end.

After stop codon at 3’ end only.

answer is C.

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Detailed Solution

An mRNA also has some additional sequences that are not translated and are referred as untranslated regions (UTR). The UTRs are present at both 5' -end (before start codon) and at 3' -end (after stop codon). They are required for efficient translation process.

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