(A) $UTR$ stands for Untranslated Regions. They are present at both $5'$-end (before start codon) and $3'$-end (after stop codon) of the $mRNA$. They

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Present in between the translational unit in $mRNA$

(A) $UTR$ stands for Untranslated Regions. They are present at both $5'$-end (before start codon) and $3'$-end (after stop codon) of the $mRNA$. They are not present between the translational unit. They are required for efficient translation and provide stability to $mRNA$.