Give an account of post transcriptional modifications of a eukaryotic $m-RNA$ .
Give an account of post transcriptional modifications of a eukaryotic $m-RNA$ .
The primary transcripts ($hn$-$RNA$) contain both the exons and the introns and are non-functional. Hence, it is subjected to a process called splicing where the introns are removed and exons are joined in a defined order. Intron is the portion of gene which is transcribed but not translated. In prokaryotes $hnRNA$ is absent so splicing in not required. $hnRNA$undergoes additional processing called as capping and tailing.
In capping an unusual nucleotide (methyl guanosine triphosphate) is added to the $5^{\prime}$-end of $hnRNA$. In tailing, adenylate residues ($200$-$300$) are added at $3^{\prime}$-end in a template independent manner. It is the fully processed $hnRNA$, now called $mRNA$, that is transported out of the nucleus for translation.
Similar Questions
$A$ : $RNA$ polymerase is of three types in eukaryotes for the synthesis of all types of $RNAs$.
$R$ : $RNA$ polymerase consists of six types of polypeptides alongwith rho factor which is involved in termination of
$RNA$ synthesis.
$A$ : $RNA$ polymerase is of three types in eukaryotes for the synthesis of all types of $RNAs$.
$R$ : $RNA$ polymerase consists of six types of polypeptides alongwith rho factor which is involved in termination of
$RNA$ synthesis.
Which of the following $RNAs$ is not required for the synthesis of protein?
Which of the following $RNAs$ is not required for the synthesis of protein?
- [NEET 2021]
One strand of the given segment of $DNA$ codes for $mRNA$ having the sequence $AUC, GCG, UCA$ needed for synthesis of proteins. The strand by which $DNA$ molecule will be responsible for the above $mRNA$ sequence is
One strand of the given segment of $DNA$ codes for $mRNA$ having the sequence $AUC, GCG, UCA$ needed for synthesis of proteins. The strand by which $DNA$ molecule will be responsible for the above $mRNA$ sequence is
: Choose incorrect sentence for $RNA$.
: Choose incorrect sentence for $RNA$.
Describe Transcription.
Describe Transcription.