<prompt> Splicing is a process ofActivation of proteinRemoval of intronsSynthesis of proteinReplication of DNA  <response>: Removal of Introns : The primary transcripts are very long ;they have molecular weights more than 10 power of 7.Molecular weight of mature mRNA is about 1-2 x 10 power of 6.This means large poion of hnRNA are cleaved off. The primary transcript contains coding regions exonsinterspersed with non-coding regions introns. These intron sequences are cleaved and the exons are spliced combined together to orm the mature mRNA molecule.This processing is done in the nucleus.Splicing is an energy requiring process. REF :DM VASUDEVAN TEXTBOOK ;7th EDITION ; Page no :591. 