Which of the following is correct for $m-RNA$ in eukaryotes ?

  • A

    Exon appera in mature $RNA$ but Intron do I not appear in mature $RNA$

  • B

    Exon and intron donot appear in mature $RNA$

  • C

    Intron appear but exons do not apper in mature $RNA$

  • D

    Exon and Intron both appear in mature $RNA$

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Transcription is a process by which

A transcription unit in $DNA$ is defined primarily by the three regions in $DNA$ and these are with respect to upstream and down stream end;

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In capping .......... is added to the $5'$ end of hn $RNA$

$A$ : $5\;S rRNA$ and surrounding protein complex provides binding site of $tRNA$.
$R$ : $tRNA$ is soluble $RNA$ with unusual bases

Define a cistron. Giving examples differentiate between monocistronic and polyeistronic transcription unit.