What are exons and introns?

What are exons?

Exon is the nucleotide sequence of DNA that is encoded for the synthesis of protein. They present in the pre-mature RNA with introns. After introns are removed by the process of RNA splicing, they remain in the final mRNA and have the specific code for specific protein synthesis via tRNA. In many genes, the exon contains open reading frame that code for protein synthesis.

What are introns?

Introns are the sequence of genes that does not code for protein synthesis. They are removed when final mature RNA takes place by RNA splicing. So they are sometimes called intervening sequence. Introns are important as they can prevent damage of the DNA and pre-mRNA.