Since the mRNA is read as codons, how many nucleotides are in each codon?
mRNA stands for messenger RNA and it serves as the bridge between the two phases of protein biosynthesis. In the transcription phase, a sequence of DNA unbinds and the sequence of nucleotides is used to make a complementary strand of messenger RNA. The mRNA then exits the nucleus and goes to a ribosome for the translation phase, where the mRNA is converted to a polypeptide sequence of amino acids to make a new protein. A codon refers to a sequence of three nucleotide that in turn codes for a specific amino acid. In addition, there are stop and start codons which tell the ribosome to either start or stop a new polypeptide sequence. So a codon is made up of three nucleotides.