What are the main modifications that RNA molecules undergo before becoming functional? Addition of 5'-cap Polyadenylation Splicing Modification of ...
What are the main modifications that RNA molecules undergo before becoming functional?
Addition of 5'-cap
Polyadenylation
Splicing
Modification of bases
I. The addition of 5'-cap is a modification that occurs at the end of transcription and is important for the stability and translation of mRNA.
II. Polyadenylation is a modification that occurs at the end of transcription and is important for the stability and transport of mRNA.
III. Splicing is a modification that occurs during transcription and involves the removal of introns from hnRNAs.
IV. Modification of bases is a modification that occurs during transcription and involves the addition or removal of specific nucleotides.
a) I and II are correct.
b) II and III are correct.
c) I, II, and III are correct.
d) I, II, III, and IV are correct.
Addition of 5'-cap
Polyadenylation
Splicing
Modification of bases
I. The addition of 5'-cap is a modification that occurs at the end of transcription and is important for the stability and translation of mRNA.
II. Polyadenylation is a modification that occurs at the end of transcription and is important for the stability and transport of mRNA.
III. Splicing is a modification that occurs during transcription and involves the removal of introns from hnRNAs.
IV. Modification of bases is a modification that occurs during transcription and involves the addition or removal of specific nucleotides.
a) I and II are correct.
b) II and III are correct.
c) I, II, and III are correct.
d) I, II, III, and IV are correct.
💡 1 Resposta
Ed 
A resposta correta é a alternativa "d) I, II, III, and IV are correct." Todas as opções apresentadas são modificações que ocorrem no RNA antes de se tornar funcional. A adição do 5'-cap é importante para a estabilidade e tradução do mRNA, a poliadenilação é importante para a estabilidade e transporte do mRNA, o splicing envolve a remoção de íntrons dos hnRNAs e a modificação de bases envolve a adição ou remoção de nucleotídeos específicos.
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