Q: Which structure includes sugar-phosphate "backbones", composed of alternating phosphate groups and deoxyribose sugars, and nitrogenous bases?


Read this paragraph and choose the correct option from the provided answers:

The DNA double helix. The two sides are the sugar-phosphate backbones, composed of alternating phosphate groups and deoxyribose sugars. The nitrogenous bases face the center of the double helix. As the base-pairing rules tell us, A always pairs with T, and G always pairs with C.

 Choices:

- molecule double helix

- mulecular triplex

- dna triple helix

- dna double helix


A:
dna double helix