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Question
The abbreviation hnRNA stands for ______.
Options
Heterogeneous nucleic Ribose nucleic acid
Heterogeneous nuclear Ribonucleic acid
Heterogeneous nucleus Ribose nucleic acid
Homogeneous nucleic Ribose nucleic acid
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Solution
The abbreviation hnRNA stands for Heterogeneous nuclear Ribonucleic acid.
Explanation:
It is the primary transcript formed directly from DNA during transcription in the nucleus of eukaryotic cells. It is called “heterogeneous” because the molecules vary significantly in size and “nuclear” because it remains confined to the nucleus until processing is complete. Often referred to as pre-mRNA, hnRNA contains both coding regions (exons) and non-coding regions (introns). Before it can be translated into a protein, it must undergo splicing to remove introns, along with capping and tailing, ultimately becoming a mature mRNA molecule ready to exit the nucleus.
