In a mRNA molecule, untranslated regions (UTRs) are present at

5 - end (before start codon)

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3 - end (after stop codon)

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both (a) and (b)

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3 - end only.

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Solution

The correct option is C both (a) and (b)
mRNA has some additional sequences that are not translated and are referred as untranslated regions, (UTRs). 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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