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In eukaryotes, after transcription of mRNA, some of its nucleotides are removed before it is translated into polypeptide. The nucleotides which are removed from mRNA are called

1. exons
2. upstream sequences
3. unusual bases
4. introns

Correct answer: introns

Solution

In eukaryotic pre-mRNA, introns are the intervening non-coding sequences that are removed by splicing before translation. Exons are the sequences retained and joined together to form mature mRNA.

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