Question

which of the following is involved in transcription of tRNA,5Sr RNA and SnRNA of eukaryotes?

Answer 1

Transcription in eukaryotic cells is considerably more complex than in bacteria. Eukaryotic cells contain three distinct nuclear RNA polymerases which transcribe different classes of genes.

RNA polymerase II transcribes protein-coding genes to yield mRNAs.

RNA polymerases I and III transcribe ribosomal RNAs  (rRNAs) and transfer RNAs (tRNAs).

RNA polymerase I transcribes three largest species of rRNAs which are designated 28S, 18S and 5.8S.

RNA polymerase III transcribes the genes for tRNAs and for the smallest species of ribosomal RNA (5S rRNA).

RNA polymerase III also transcribes some of the small RNAs involved in splicing and protein transport (snRNAs and scRNAs).