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The repeating unit of a double helix, such as that of DNA, consists of three main parts: a phosphate group, a sugar molecule (deoxyribose in DNA), and a nitrogenous base (adenine, thymine, cytosine, or guanine). These components form the backbone of the helix through phosphate-sugar linkages, while the nitrogenous bases pair in specific combinations (A with T and C with G) to create the genetic code. Together, they contribute to the structural integrity and function of the DNA molecule.

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