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Which description best explains Watson and Crick's DNA model? DNA is a single–stranded molecule that has nitrogenous bases toward its exterior. DNA is a double helix made of two strands linked together with hydrogen bonds. DNA is a double helix that contains nitrogenous bases toward its exterior.

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B) DNA is a double helix made of two strands linked together with hydrogen bonds.

Watson and Crick were one of the first scientists to model and describe the structure of DNA correctly. DNA is a double helix with two sugar-phosphate backbones. The two strands are linked by hydrogen bonds between their nitrogenous bases.

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