Which norms may be violated without serious consequences and are often not enforced?

DNA is composed of building blocks called nucleotides. In the structure of DNA, nucleotides are composed of codons which are made up of nitrogen bases: adenine, guanine, uracil and thymine. In this case, adenine and guanine are paired while uracil and thymine are on the other hand paired. The different combinations pertain to different DNA make-up