What is indicated by ‘a’ in the figure?

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Extron

Intron

Intein

Exon

answer is D.

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Detailed Solution

The primary transcript formed by the activity of RNA polymerase contain both the exons and introns . Due to the presence of introns primary transcript is non functional hence it is subjected to a process called splicing where the introns are removed and exons are joined in a defined order.

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