Does a codon consist of four nucleotides?

Codons are triplet codes that comprise the genetic code. They consist of a sequence of three DNA or RNA nucleotides. In total, there are 64 unique codons that can be translated into 20 amino acids that bind together to create proteins in the human body.

Codons are composed of triplets of nucleotides. Each individual codon of the genetic code comprises three of the four nucleotides adenine, cytosine, uracil and thymine. With three exceptions, the 64 unique triplet nucleotide combinations each correspond to one amino acid. The codons translate in the cytoplasm of human cells, and amino acids are created. As amino acids are created they link together to form primary proteins.