Different forms of the double helix: architecture and function

The DNA double helix was discovered 50 years ago. This motif was found in several other places, most notably in RNA molecules. It is also found in DNA-RNA hybrids as well as transfer RNA molecules where double helical segments combine to form a more complex structure. A distinct variant of the DNA molecule was discovered in which the helix turns left-handed, which has led to practical consequences in the treatment of certain viral diseases