Answer :
In eukaryotes, the sequences of a primary transcript included in the mRNA are called Exons, whereas sequences spliced out of the mRNA are called Introns.
What is mRNA?
A form of single-stranded RNA involved in protein synthesis is known as messenger RNA (abbreviated as mRNA). During transcription, mRNA is created from a DNA template. The purpose of mRNA is to transport protein information from DNA in a cell's nucleus to the cytoplasm, or watery interior, of the cell. There, the machinery responsible for making proteins reads the sequence of the mRNA and converts each three-base codon into an amino acid that belongs in a protein chain.
As the transcript's exons are connected and the introns in between them are excised, a mature mRNA is produced. So, the sequences of a primary transcript included in the mRNA are called Exons, whereas sequences spliced out of the mRNA are called Introns.
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