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The double helical structure of DNA was proposed by Watson and Crick in 1953 based on X-ray diffraction studies and biochemical evidence. DNA consists of two long polynucleotide strands that coil around a common axis to form a right-handed double helix. Each strand is made of repeating nucleotides composed of deoxyribose sugar, phosphate group, and nitrogenous base. The sugar-phosphate backbone forms the outer part of the helix, while the nitrogenous bases are _________ ___ ______ __________ _________ __________ _________ ___ _____ __________.
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