Removal of introns and joining the exons in a defined order in a transcription unit is called:
Correct answer: D. Splicing
- A. Tailing
- B. Transformation
- C. Capping
- D. Splicing
Explanation
mRNA is not made directly in a eukaryotic cell. It is transcribed as heterogeneous nuclear RNA (hnRNA) in the nucleus. hnRNA contains introns and exons. The introns are removed by RNA splicing, leaving behind the exons, which contain the information. The exonic regions of RNA are joined together to produce a single-chain RNA required for functioning as a translational template.
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About Chromosomes
Chromosomes are DNA-protein structures that carry genes and become visible during cell division. Coverage includes chromatin, centromeres, sister chromatids, homologous chromosomes, chromosome number, and the distinction between diploid and haploid cells, with links to DNA replication, mitosis and meiosis.
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