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Which of the following reunites the exon segments after RNA splicing : -
A
RNA polymerase
B
RNA primase
C
RNA ligase
D
RNA proteases
Detailed Solution
In splicing, the introns are cut out of the primary transcript (hnRNA) and the exons are joined together to make the mature mRNA.
The joining of the cut ends of the exons is a ligation reaction (formation of a phosphodiester bond). In this question, the agent that reunites the exons is called RNA ligase.
(In eukaryotic nuclear mRNA, this is actually carried out by the spliceosome, made of snRNAs and proteins; a separate RNA ligase is used in tRNA splicing.)
So, as per the answer key, RNA ligase reunites the exon segments.
The joining of the cut ends of the exons is a ligation reaction (formation of a phosphodiester bond). In this question, the agent that reunites the exons is called RNA ligase.
(In eukaryotic nuclear mRNA, this is actually carried out by the spliceosome, made of snRNAs and proteins; a separate RNA ligase is used in tRNA splicing.)
So, as per the answer key, RNA ligase reunites the exon segments.