Instructions

Introns are removed from the primary transcript or pre-mRNA by a process called RNA splicing. Which of the following statement about mRNA splicing is correct?

a. The transesterification reactions are carried out by the “spliceosome” which is a large complex of proteins and lipids

b. during the splicing reaction there is no net gain in the number of chemical bonds, therefore, no ATP is consumed during splicing

c. in some rare genes, the intron itself folds into a specific conformation within the precursor mRNA and catalyzes the chemistry of its own release

d. the splicing reactions fuse two introns and release the exon in the form of a branched structure called a lariat

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