Primary transcript OH RNase d cut VUAUCAGUUAAUU 5 RNase p eut Splicing Addition Cleavage CCA ArecA to 3 end AACCG A 3 OH OH Figure Processing of tRNAs in bacteria and Base eukaryotes, The sequences shown in yellow are modification ACCRA AACO (b) some by splicing reactions. (c) CCA is added to the 3 end in eukaryotic tRNAs and in those bacte- (d) rial tRNAs that lack this sequence in the primary transcript; this reaction is catalyzed by tRNa nu cleotidyl transferase (d)Finally, specific bases are modified(see Fig. 25-25) Mature tRNA