Which part of a gene is removed during RNA processing?

• A. Exon
• B. Intron
• C. Promoter
• D. Coding Sequence

Answer: (B)

During RNA processing, the cell edits the initial transcript (pre-mRNA) into mature mRNA. The key step is splicing, where introns—noncoding regions—are removed and the exons are joined together. This creates a continuous coding sequence in the mature mRNA that will be translated into protein. The promoter is a DNA element that helps start transcription and isn’t part of the RNA after processing, while the coding sequence is the part that remains to be translated. So, the intron is the part removed during RNA processing.