what do we call the shape or arrangement of a strand of dna

The shape or arrangement of a strand of DNA is called a double helix or duplex structure. It consists of two strands that run in two opposite directions, such as the 5 to 3 direction, and twist together. Each DNA strand within the double helix is a long, linear molecule made of smaller units called nucleotides that form a chain. The chemical backbones of the double helix are made up of sugar and phosphate molecules that are connected by chemical bonds, known as sugar-phosphate backbones. The two helical strands are connected through interactions between pairs of nucleotides, also called base pairs. Two types of base pairing occur: nucleotide A pairs with T, and nucleotide C pairs with G.