What are introns?

What are introns?

• A. Noncoding segments removed during RNA processing
• B. Coding segments
• C. Promoters
• D. Exons

Answer: (A)

Introns are the noncoding segments within a gene that are transcribed into RNA but do not encode protein. In many eukaryotic genes, the DNA sequence consists of exons, which carry the protein-coding information, interspersed with introns, which are intervening sequences. After transcription, the resulting pre-mRNA includes both introns and exons. The spliceosome recognizes the boundaries and removes the introns, joining the exons together to form mature mRNA that can be translated into a protein. While introns are not translated themselves, they can play roles in regulating expression and enabling alternative splicing, which allows a single gene to produce multiple protein variants. Promoters are separate regulatory elements that help initiate transcription, and exons are the coding segments that ultimately become part of the protein.

Introns are the noncoding segments within a gene that are transcribed into RNA but do not encode protein. In many eukaryotic genes, the DNA sequence consists of exons, which carry the protein-coding information, interspersed with introns, which are intervening sequences. After transcription, the resulting pre-mRNA includes both introns and exons. The spliceosome recognizes the boundaries and removes the introns, joining the exons together to form mature mRNA that can be translated into a protein. While introns are not translated themselves, they can play roles in regulating expression and enabling alternative splicing, which allows a single gene to produce multiple protein variants. Promoters are separate regulatory elements that help initiate transcription, and exons are the coding segments that ultimately become part of the protein.