30. How can one identify the presence of introns in a hybrid of DNA and mRNA? Give an example of non-coding RNA and a regulatory DNA element.

Biochemistry
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Chapter1: Biochemistry: An Evolving Science
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30. How can one identify the presence of introns in a hybrid of DNA and mRNA? Give an example of non-coding RNA and a regulatory DNA element. 

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Introns are non-coding sequences, whereas exons are coding sequences. Splicing is the process of joining of exons by removing the introns. The mRNA synthesized through translation undergoes splicing to remove introns and synthesize mature mRNA. Splicing is co-transcriptional and post-transcriptional in eukaryotes. But there is less or no splicing in prokaryotes, because there occurs translation soon after the transcription process in prokaryotes.

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