Question

А Help Center? Question 27 Which of the following statement is correct regarding posttranscriptional activity? Pre-mRNA is capped before undergoing splicing. tRNA is transcribed as one short transcript and is modifed by RNA pol II. Pre-mRNA is spliced before capping, rRNA is cleaved from tRNA transcript.

Answer 1

Answer- pre-mRNA is capped before undergoing splicing.

Explanation -

Post-transcriptional modifications OF RNA accomplish 2 things: 1) Modifications facilitate the RNA molecule to be recognized by molecules that mediate RNA translation into proteins; 2) throughout post-transcriptional process, parts of the RNA chain that aren't purported to be translated into proteins square measure cut out of the sequence. during this means, post-transcriptional process helps increase the potency of supermolecule synthesis by permitting solely specific protein- cryptography RNA to travel on to be translated. while not post-transcriptional process, supermolecule synthesis can be considerably slowed, since it'd take longer for translation machinery to acknowledge RNA molecules and considerably additional RNA would got to be unnecessarily translated to realize identical results.

Here 3 processes are mentioned that undergo in structure during post- transcriptional modifications: 5' capping, addition of the poly A tail, and conjunction. The 5' capping reaction replaces the triphosphate cluster at the 5' finish of the RNA chain with a special ester that's observed because the 5' cap. it's thought to assist with ribonucleic acid recognition by the cell organ throughout translation. A modification additionally takes place at the other finish of the RNA transcript. To the 3' finish of the RNA chain 30-500 adenines square measure another in what's known as a poly A tail.