<prompt> Part of eukaryotic DNA contributing to polypetide synthesisa Exonb Enhancerc Leader sequenced tRNAe ncRNAacaadab  <response>: Exon coding protein : Sequence of a gene that is represented as m-RNA.Enhancer: Are special cis-acting DNA sequences that increase the rate of initiation of transcription of eukaryotic genes by RNA polymerase II.Leader sequence: Sequence at the 5 end of a mRNA that is not translated into protein.Non-coding RNA nc RNA: Functional RNA that is not translated into a protein. Non-coding RNAs include tRNA, rRNA, Sno RNA, mi-RNA, si-RNA, pi-RNA and long nc RNA like Xist HOT AIR. 