Proteins are composed of 20 different amino acids
A sequence of 3 nucleotides is used to code each amino acid
Each triplet of nucleotides is called a codon
Start codon AUG codes for amino acid methionine
3 stop codons
There are 64 codons in the genetic code 43=64
Several different codons can code for the same aa, but no
codon ever has more than one amino acid counterpart.
Codons are always written in the form of the RNA transcript
from the original DNA molecule.