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

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

Molecular Basis of Inheritance

Solution:

$mRNA$ 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.