In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Q: DNA was first isolated by Friedrich Miescher in 1869. Its molecular structure was first identified by James Watson and Francis Crick at the Cavendish Laboratory within the University of Cambridge in 1953, whose model-building efforts were guided by X-ray diffraction data acquired by Raymond Gosling, who was a post-graduate student of Rosalind Franklin. DNA is used by researchers as a molecular tool to explore physical laws and theories, such as the ergodic theorem and the theory of elasticity. The unique material properties of DNA have made it an attractive molecule for material scientists and engineers interested in micro-and nano-fabrication. Among notable advances in this field are DNA origami and DNA-based hybrid materials.
A:
when was dna first discovered and by whom