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Select the description of an intron. modified form of a guanine nucleotide added onto the end...

Select the description of an intron.

modified form of a guanine nucleotide added onto the end of pre‑mRNA

coding portion of a DNA sequence that is present in mature mRNA

sequence of adenine nucleotides added onto the end of pre‑mRNA

noncoding portion of a DNA sequence that is removed from pre‑mRNA

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Answer #1

Introns are the non coding portion of a DNA sequence that is removed from pre-mRNA. The coding portion in a DNA sequence is called as Exons. Exons must be joined together to form a coding RNA i.e. proper functional mRNA. This process of removal of Introns and joining of Exons is called as Splicing. It occurs in pre-mRNA and inside nucleus with the help of small non - coding RNA and some Splicing factors (assemble to form spliceosome). So, the correct option to this question is the last option.

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