At the beginning of most or if not all living organisms is a cell. And in this cell is some form of genetic material. The genetic material is often DNA, which in my eyes is one of the most interesting molecules throughout science.
My reason for my intrigue behind DNA, is not because of its extremely long name, which I used to enjoy sprouting as a child, but because of its rather interesting history and its ability to govern the characteristics which we show to the outside world. It's marvellous, that something so small can control something as complex as human life.
Explorer fact: DNA was initially thought to be a triple heliex.