Although all known cellular life and some viruses contain DNA, biologists in the early 1900's had difficulty identifying DNA as the genetic material because of its
apparent simplicity. Although it is a long polymer, it is only composed of four
subunits-A, T, C, and G. It wasn't until the 1940's that scientists came to the
conclusion that DNA was in fact the molecule that contained the genetic
material. In 2-3 sentences, describe how DNA molecules store genetic
information for cells.