All of the following are synonymous codon pair EXCEPT: (A) CAU & CAC, (B) AUU & AUC, (C) AUG & AUA, (D) AAU & AAC
Answer is C. Synonymous codons Codons that specify the same amino acids. E.g- GGA, GGG, GGU, and GGC codes for glycine Methionine is coded by AUG only. So, there is no synonymous codon for methionine.