9. Which of the following statements regarding introns is not correct? (A) Introns are removed when primary transcript is processed to give mature RNA. (B) Intron junctions are defined by the GU-AG rule: starts with the dinucleotide GU and ends with the dinucleotide AG. (C) As genome size increases, the tendency is for exons to become large and introns remain small. (D) Aptamers can be used to control intron splicing. (E) Many animal micro RNA (miRNA) genes are located in introns of protein-coding genes.