In 1953, the scientists James Watson and Francis Crick published their landmark findings on the structure of DNA. Watson and Cri
ck deduced the structure of DNA by unifying evidence that they collected from several scientists who were also seeking to answer this important question. Identify the pieces of evidence describing the features of DNA that Watson and Crick used to determine the structure of DNA. a. A purine base forms covalent bonds with a pyrimidine base located on the opposite DNA helix. b. DNA forms a right-handed double helical structure with two polynucleotide chains coiled around a central axis. c. The two chains are parallel, both running in a 5' to 3' direction. d. A purine base forms hydrogen bonds to pair with a pyrimidine base located on the opposite DNA strand. Specifically, A pairs with T, and C pairs with G. e. The sugar-phosphate backbones of each DNA helix run antiparallel to one another. f. The diameter of the DNA double helix is 2 nanometers, with each purine-pyrimidine base pair spanning an equivalent distance between the two chains.
d. A purine base forms hydrogen bonds to pair with a pyrimidine base located on the opposite DNA strand. Specifically, A pairs with T, and C pairs with G.
