Following splicing,the conserved adenosine nucleotide within the intron displays an unusual array of bonds,including: A)a phosphate attached to the 4-carbon of the adenine nitrogenous base. B)phosphodiester bonds attached at three places on the ribose (2′,3′,5′). C)additional methyl (-CH₃)groups added to the adenine. D)a DNA strand attached to the spliced RNA. E)attachment to an arginine amino acid.

Question

Quizplus · Accepted Answer

The conserved adenosine nucleotide within the intron after splicing contains phosphodiester bonds attached at three places on the ribose (2′,3′,5′). This is due to the fact that during splicing, the intron is cut at the 5′ splice site and the 3′ splice site, and the two exons are joined by a phosphodiester bond between the 5′ end of the intron and the 3′ end of the preceding exon, and between the 3′ end of the intron and the 5′ end of the following exon. The adenosine nucleotide within the intron is included in this process, and therefore, it also contains these phosphodiester bonds on its ribose sugar. None of the other options describe the bonds that are formed within the conserved adenosine nucleotide after splicing.

Following Splicing,the Conserved Adenosine Nucleotide Within the Intron Displays an Unusual