Answer:
See the answer below, please.
Explanation:
DNA is made up of nucleotides, which are composed of: phosphate group, sugar (deoxyribose) and nitrogenous base (adenine, cytosine, guanine or thymine). These nucleotides join together to form a double spiral-type chain (the double helix). In the base matings by hydrogen bonds: adenine pairs with thymine, and guanine with cytosine (this is inside the double helix and the sugar-phosphate skeleton on the outside).
