In eukaryotes, the size of the primary transcript is generally the same length as the gene in the template DNA strand.
A primary transcript is an exact RNA copy of a DNA coding sequence.
Primary transcripts are also called heterologous nuclear RNAs (hnRNAs) because they contain 0-50 introns of varying lengths. The introns to be removed are joined at both ends by specific sequences of bases called splice sites or splice junctions.
RNA transcripts immediately after transcription in the nucleus, prior to RNA splicing or polyadenylation to form mature mRNA.
Although DNA is double-stranded, handiest one strand at a time serves because the template for transcription. This template strand is referred to as the non-coding strand.The non-template strand is referred to as the coding strand due to the fact its series is similar to that of the brand new RNA molecule.
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