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| Column-$I$ | Column-$II$ |
|---|---|
| $i$. Cistron | $a$. Addition of methylated $GTP$ to $5'$-end of $hnRNA$. |
| $ii$. Exon | $b$. Non-coding sequences which are removed by splicing. |
| $iii$. Intron | $c$. Segment of $DNA$ coding for a polypeptide. |
| $iv$. Capping | $d$. Coding sequences which appear in processed $mRNA$. |
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