What is true about introns in genes?

What is true about introns in genes?

• A. They are removed during RNA processing
• B. They code for proteins
• C. They are present in bacterial genes
• D. They are translated into amino acids

Answer: (A)

Introns are intervening, noncoding segments within genes that are transcribed into the initial RNA transcript but removed during RNA processing by splicing to make the mature mRNA. They don’t code for proteins themselves; only the exons—thecoding portions—are joined to form the final mRNA that is translated. In bacteria, introns are typically absent, so the idea that introns are present in bacterial genes isn’t generally true. Introns are not translated into amino acids because they’re removed before translation. The important point is that introns are taken out during RNA processing, while the exons provide the protein-coding information.

Introns are intervening, noncoding segments within genes that are transcribed into the initial RNA transcript but removed during RNA processing by splicing to make the mature mRNA. They don’t code for proteins themselves; only the exons—thecoding portions—are joined to form the final mRNA that is translated. In bacteria, introns are typically absent, so the idea that introns are present in bacterial genes isn’t generally true. Introns are not translated into amino acids because they’re removed before translation. The important point is that introns are taken out during RNA processing, while the exons provide the protein-coding information.