What are the parts of a DNA double strand?

A DNA double strand consists of two long chains of nucleotides, which are the building blocks of DNA. Each nucleotide contains a phosphate group, a sugar molecule (deoxyribose), and a nitrogenous base (adenine, thymine, cytosine, or guanine). The two strands are held together by hydrogen bonds between complementary bases—adenine pairs with thymine, and cytosine pairs with guanine. The overall structure is a double helix, with the sugar-phosphate backbone forming the outer structure and the nitrogenous bases pairing in the interior.