DNA

The fabled DNA during assembly.

Deoxyribonucleic acid, better known by its stage name DNA, is a set of secret instructions written inside of an organism telling it how to build another one of itself. As such, it is the basis of everything that lives and breathes, making it based according to American society. Its counterpart, RNA, is considered a C-tier scroll. DNA is well known for being an endless spiral staircase.

Because thymine is better at weightlifting than uracil, it therefore has admission to DNA, while uracil is relegated to the inferior RNA. Unfortunately, this is just thymine not loving thy neighbour.