The untranslated regions

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are present only at 3' -end of mRNA

are present only at 5' -end of mRNA

are present at both 5' -end and at 3' -end of mRNA

decreases the efficiency of the translation process.

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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