A) promoter
B) regulator
C) intron
D) exon
Correct Answer: B
Solution :
In eukaryotes, the regulation of gene expression involves splicing together of exonic portions of RNA to give rise to functional m-RNA. Introns are DNA sequences lying within a coding sequence, but not usually encoding cell product. Exon is a DNA sequence encoding and gives rise to a translated polypeptide sequence (protein).
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