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Unformatted text preview: • Contains punctuation signals: “Start” (AUG) initiates translation while “stop” (UAA, UAG, UGA) terminates translation. • Commaless: No internal punctuation is used. • Non overlapping: Every single nucleotide at a specific location within the mRNA is part of only one triplet. • Almost universal: With only minor exceptions, a single coding dictionary is used by almost all viruses, prokaryotes, and eukaryotes. The most important exceptions to the universality of the genetic code occur in mitochondria of mammals, yeast, and other species. In mitochondria: 1. UGA specifies tryptophan rather than stop. 2. AUA is a methionine codon, not an isoleucine codon. 3. AGA and AGG are chain termination codon rather than arginine codons....
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This note was uploaded on 04/07/2008 for the course BIOL 40 taught by Professor Seligman during the Spring '08 term at Claremont.
- Spring '08