DNA Lecture slides

This document discusses what was known about DNA in the early 1950s and the discovery of its structure. It was known that DNA contained phosphorus, deoxyribose sugar, and the nitrogen bases adenine, guanine, thymine and cytosine. Researchers like Wilkins, Franklin, Watson, and Crick were studying DNA and proposed the double helix structure based on Franklin's X-ray diffraction images, with complementary base pairing of A-T and C-G. This double helix model explained DNA's structure and how it replicates.