Answer:
Transcription is considered to be a more complex process in eukaryotic cells because of the following features
(i) In nucleus, there are three types of RNA polymerases and there is division of labour. (a) RNA polymerase - I, transcribes rRNAs. (b) RNA polymerase - II, transcribes precursor mRNA, i.e. hnRNA. (c) RNA polymerase - III, transcribes tRNA and other small RNAs. (ii) hnRNA (primary transcript of mRNA) contains both coding sequences called exons and non - coding sequences called introns. So, it undergoes splicing, in which non - coding sequences (introns) are removed and the coding sequences (exons) are joined together in a defined order. (iii) Eukaryotes require processing of mRNA to make it active.
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