C. 1930's-1940's Nucleic Acid composition is identified. Oswald Avery was a microbiologist. Edwin Chargaff was a biochemist. Linus Pauling was the first to figure out the complicated structure of proteins - a helical structure he figured that the structure of the hereditary instructions can't be far behind. James Watson and Francis Crick put together a model of DNA with two strands of nucleotides.
H bonds form when two strands run in opposite directions and twist into a double helix.
Two identical nucleotide strands are arranged opposite and parallel to each other. Nitrogenous bases of opposite strands are paired in a complimentary fashion. The Relationship Between DNA, Chromosomes, and Genes. A. Organization of DNA in Chromosomes 1. Each eukaryotic chromosome contains one long DNA molecule.