In the genetic code,when the first two nucleotides of a triplet are identical and the third letter is U or C,the codon always codes for the same amino acid.

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This is true. For example, if the first two nucleotides of a codon are GG and the third letter is U or C, the codon codes for glycine. Similarly, if the first two nucleotides are CC and the third letter is U or C, the codon codes for proline. This characteristic of the genetic code is called codon degeneracy.

In the Genetic Code,when the First Two Nucleotides of a Triplet