Are introns coding sequences?

Are introns coding sequences?

• A. Yes
• B. No
• C. Sometimes
• D. Unknown

Answer: (B)

Introns are sequences within a gene that are copied into RNA but not used to make the protein. In eukaryotic genes, the initial transcript (pre-mRNA) contains both exons, which will encode amino acids, and introns, which are noncoding. During RNA processing, the introns are spliced out and the exons are joined together to form mature mRNA. Translation uses the sequence from the exons to build the protein, so introns do not code for the protein itself. Some introns can have regulatory roles or give rise to noncoding RNAs, but that doesn’t make them coding for the protein’s amino acid sequence.

Introns are sequences within a gene that are copied into RNA but not used to make the protein. In eukaryotic genes, the initial transcript (pre-mRNA) contains both exons, which will encode amino acids, and introns, which are noncoding. During RNA processing, the introns are spliced out and the exons are joined together to form mature mRNA. Translation uses the sequence from the exons to build the protein, so introns do not code for the protein itself. Some introns can have regulatory roles or give rise to noncoding RNAs, but that doesn’t make them coding for the protein’s amino acid sequence.