In the standard genetic code, how many amino acids have codons that allow synonymous mutations in the first position?

Question

Quizplus · Accepted Answer

In the standard genetic code, only two amino acids, leucine and arginine, have codons that allow for synonymous mutations in the first position of the codon. This means that a change in the first nucleotide of their codons can still result in the same amino acid being encoded.

In the Standard Genetic Code, How Many Amino Acids Have