Use the following model of a eukaryotic transcript to answer the next few questions. 5' UTR E₁ I₁ E₂ I₂ E₃ I₃ E₄ UTR 3' -Which of the following is a useful feature of introns for this model?
A) They are translated into small polypeptides. B) They become parts of snRNPs. C) Each intron has enzymatic properties. D) Introns allow exon shuffling. E) Introns protect exon structure.