Which of the following correctly describes introns and exons?

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Multiple Choice

Which of the following correctly describes introns and exons?

The main concept being tested is how RNA processing in eukaryotes separates non-coding and coding regions before mature mRNA forms. During transcription, the initial transcript contains both introns and exons. The introns, which do not code for protein, are removed by the splicing machinery, and the exons, which do code for the protein (and may include untranslated regions), are stitched together to create the mature mRNA that will be translated. This statement correctly captures that introns are non-coding regions that are removed, while exons are the coding regions that are joined together to form the final mRNA. The other descriptions are inaccurate because they imply that introns remain in the mature message, or that exons are removed, or that exons are non-coding.

The main concept being tested is how RNA processing in eukaryotes separates non-coding and coding regions before mature mRNA forms. During transcription, the initial transcript contains both introns and exons. The introns, which do not code for protein, are removed by the splicing machinery, and the exons, which do code for the protein (and may include untranslated regions), are stitched together to create the mature mRNA that will be translated.

This statement correctly captures that introns are non-coding regions that are removed, while exons are the coding regions that are joined together to form the final mRNA. The other descriptions are inaccurate because they imply that introns remain in the mature message, or that exons are removed, or that exons are non-coding.

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