[Campbell Biology P.395] Which of the following statements correctly distinguishes between i... | Practice Question

Which of the following statements correctly distinguishes between introns and exons in eukaryotic genes?

  • A: Introns are coding segments, while exons are noncoding segments.
  • B: Introns are translated into amino acid sequences, while exons are removed during splicing.
  • C: Introns are intervening sequences removed during RNA splicing, while exons are segments that are eventually expressed.
  • D: Both introns and exons are translated into proteins after transcription.

Explanation

The text states that 'The noncoding segments of nucleic acid that lie between coding regions are called intervening sequences, or introns. The other regions are called exons, because they are eventually expressed, usually by being translated into amino acid sequences.' It also explains that 'In the process of RNA splicing, the introns are cut out from the molecule and the exons joined together, forming an mRNA molecule with a continuous coding sequence.'