(d) Polypeptide synthesis is signaled
by two initiation codons commonly AUG or methionine codon and rarely GUG or
valine codon. Since there are 64 triplet codons and only 20 amino acids, the
incorporation of some amino acids must be influenced by more than one codon.
Only tryptophan (UGG) and methionine
(AUG) are specified by single codons. AUG codes for methioninein both
prokaryotes and eukaryotes.
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