One function of the spliceosome is to: (Select all that apply.) A. recognize the beginning and end of the introns. B. recognize the 5\' end of the primary transcript. C recognize the beginning and end of the exons. D recognize the 3\' end of the primary transcript. Solution The correct answer is :A. recognize the beginning and end of the introns. Reason: Spliceosome consists of snRNAs and snRNPs which together make a complex.This complex binds to the beginning and end of the introns and forms a loop which is later excised and the ends of exons are sealed..