Which of the following doesn't occur during the processing of RNA?: (A) Terminal addition, (B) Nucleoside modification, (C) Nucleoside cleavage, (D) Chemical hydrolysis
Answer is D. Precursor tRNA is processed to form mature tRNA. Alterations during processing are of three types: nucloelytic reactions, nucleoside modifications, terminal additions of nucleotides. Chemical hydrolysis is not a pa of RNA processing. Poly A tailing and 5'capping occurs in the processing of RNA. Methylation and deamination are known to occur. Introns will be removed after cleavage in the process.