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BIO NMDCAT Ribonucleic acid (RNA)
nmdcat.online July 3, 2026

99. During the process of RNA editing observed in certain eukaryotic transcripts, specific cytidine deaminase enzymes convert targeted cytosine bases into uracil. If this conversion occurs inside a coding exon, it can alter translation by

A. Changing an internal stop codon into an amino acid codon
B. Creating a premature stop codon that truncates the protein
✓
C. Altering the 3' polyadenylation signal site configuration
D. Inhibiting the attachment of the 7-methylguanosine cap element

📝 Explanation

Converting a CAA codon (coding for glutamine) into a UAA codon introduces a premature stop signal, producing a shorter, tissue-specific protein.

📖 Additional Information

  • Changing an internal stop codon into an amino acid codon
  • Creating a premature stop codon that truncates the protein
  • Altering the 3' polyadenylation signal site configuration
  • Inhibiting the attachment of the 7-methylguanosine cap element

Converting a CAA codon (coding for glutamine) into a UAA codon introduces a premature stop signal, producing a shorter, tissue-specific protein.

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