Lecture.15.Fall.2013(1)

Universal what does the code tell us degeneracy and

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Unformatted text preview: nonsense codons (UAA, UAG, UGA) The Genetic Code • Linear • A “triplet” code - each “word” is three “letters” long, and encodes one amino acid • Letters = nucleotides (A, U, G, C) • Words = “codons” • Unambiguous (each codon specifies only one amino acid) The Genetic Code • Degenerate - some amino acids are specified by more than one codon • Includes “start” and “stop” codons • No punctuation (“commaless”) • Nonoverlapping • Universal What does the code tell us? • Degeneracy and “wobble” – Codons encoding the same amino acid tend to share the first two nucleotides • proline is encoded by all four CC_...
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