Deoxyribonucleic acid (DNA) is found in all prokaryotic and eukaryotic cells and many viruses. This complex molecular structure is certainly one of the most interesting molecules. Interest in its structure and dynamics is primarily due to the important role that this molecule plays in life processes. The molecule was first identified in the 1860s by the Swiss chemist Johann Friedrich Miescher. He discovered a substance that had unexpected properties, different from those of the other proteins he had been familiar with. He did not know he had discovered the molecular basis of life, which he called nuclein.