[Campbell Biology P.396] According to Figure 17.14 and the accompanying text, what is the re... | Practice Question

According to Figure 17.14 and the accompanying text, what is the relationship between exons and protein domains?

  • A: Each exon always codes for an entire, complete protein.
  • B: Introns are the primary sequences that code for protein domains.
  • C: Different exons often code for different functional domains within a protein.
  • D: Protein domains are formed only after post-translational modification and are unrelated to exons.

Explanation

The text states that 'Proteins often have a modular architecture consisting of discrete structural and functional regions called domains. ... In quite a few cases, different exons code for the different domains of a protein Figure 17.14 .' Figure 17.14 visually reinforces this by showing how different exons correspond to different domains of a polypeptide.