The correct option is 4: RNA Polymerase II (RNA Pol II) is the maestro of the eukaryotic transcription orchestra, specifically tasked with transcribing the vast library of protein-coding genes. The immediate product of RNA Pol II's action on these genes is a lengthy, unprocessed precursor molecule known as heterogeneous nuclear RNA (hnRNA), which is the direct precursor to mature messenger RNA (mRNA). This term, hnRNA, accurately captures the primary transcript…Read More