<prompt> All of the following require 5 capping except?mRNA for HistonesiRNAtRNA of AlanineU6 snRNA  <response>: tRNA of Alanine does not require 5 capping. Capping process protects the 5 end of mRNA from the action of exonucleases and polyadenylation protects the 3 end of the mRNA. All mRNA, snRNA, and siRNA undergo this process, but tRNA are comparatively stable and do not require a capping at the 5 end. Reference: Harpers illustrated biochemistry 30th edition 