DNA (DeoxyriboNucleic Acid) is a molecule that carries the genetic instructions used in the growth and development of all known living organisms and many viruses. DNA and RNA are nucleic acids; alongside proteins and complex carbohydrates. Most DNA molecules consist of two biopolymer strands coiled around each other to form a double helix.
Dr. Rosalind Franklin a brilliant chemist was the first person to take X-ray diffraction images of DNA, particularly Photo 51, while at King's College London. This led to the discovery of the DNA double helix for which Dr. James Watson and Dr. Francis Crick won the Nobel Prize.
(See Also: https://en.wikipedia.org/wiki/DNA)
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