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  • Amino Acids and Protein Structure
  • Which of the following amino acids is coded by UAG?
Multiple choice

Which of the following amino acids is coded by UAG?

  1. Methionine

  2. Lysine

  3. Pyrrolysine

  4. Glutamine

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

UAG is typically a stop codon, but in certain archaea and bacteria, it codes for pyrrolysine, the 22nd proteinogenic amino acid. Pyrrolysine is used in methane-producing metabolism by some organisms.

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