Which amino acids are coded for by the most codons?
A) glycine and alanine
B) glycine and leucine
C) leucine and serine
D) leucine and methionine

Question

Quizplus · Accepted Answer

Leucine is coded for by 6 codons (UUA, UUG, CUU, CUC, CUA, CUG) and serine is coded for by 6 codons (UCU, UCC, UCA, UCG, AGU, AGC), making them both tied for being coded for by the most codons. None of the other answer choices contain both of these amino acids.

Which Amino Acids Are Coded for by the Most Codons