It is the messenger RNA codon that carries the message specifying a certain amino acid; it is the transfer RNA that transfers that amino acid to the growing protein chain. The tRNA anticodon is a sequence of three nucleotides that are the complement of the three nucleotides in the mRNA codon.

What does a codon carry?

Each tRNA is designed to carry a specific amino acid that it can add to a polypeptide chain. ... This order is determined by the attraction between a codon, a sequence of three nucleotides on the mRNA, and a complementary nucleotide triplet on the tRNA, called an anticodon.

What codons do not carry amino acids?

There are 3 STOP codons in the genetic code - UAG, UAA, and UGA. These codons signal the end of the polypeptide chain during translation. These codons are also known as nonsense codons or termination codons as they do not code for an amino acid.