<prompt> Splicing activity is a function of:mRNAsnRNAtRNArRNA  <response>: Small Nuclear RNA SnRNA:They belong to small RNAs of size 90 to 300 nucleotides1 of total RNAsThey have ribozyme activity.FunctionmRNA Processing U1, U2, U4,U5, U6 and U7 as a part of spliceosomerRNA processingGene regulation.Harper 30th edition Pg-408,411 