Introns are

Introns are

• A. coding regions expressed
• B. non-coding regions
• C. translated into proteins
• D. promoter sequences

Answer: (B)

Introns are non-coding regions within genes that are transcribed into RNA but are removed from the final messenger RNA before it's translated into protein. They don’t contain instructions for amino acid sequences; those instructions are found in the exons, the coding portions that remain in mature mRNA. This is why introns are not translated themselves. Promoter sequences, in contrast, are regulatory DNA regions located upstream of a gene that help initiate transcription by attracting RNA polymerase. So introns are non-coding and are spliced out during RNA processing, rather than being translated or serving as promoter regions.

Introns are non-coding regions within genes that are transcribed into RNA but are removed from the final messenger RNA before it's translated into protein. They don’t contain instructions for amino acid sequences; those instructions are found in the exons, the coding portions that remain in mature mRNA. This is why introns are not translated themselves. Promoter sequences, in contrast, are regulatory DNA regions located upstream of a gene that help initiate transcription by attracting RNA polymerase. So introns are non-coding and are spliced out during RNA processing, rather than being translated or serving as promoter regions.