DNA, Deoxyribonucleic acid is a large, double-stranded molecule that stores the genetic information required to regulate cell structure and processes., Purine, Nitrogenous bases with a double-ring structure. They are adenine (A) and guanine (G), Pyrimidine, Nitrogenous bases with a single-ring structure. They are cytosine (C), Thymine (T), and uracil (U)., Hydrogen bonds, Weak bonds that form between complementary bases, holding the two DNA strands together, Complementary base pairing rule, In DNA, adenine pairs with thymine (A–T) via two hydrogen bonds, and guanine pairs with cytosine (G-C) via three hydrogen bonds., Nucleotide, The basic building block (monomer) of nucleic acids. Each nucleotide consists of a phosphate group, a sugar, and a nitrogenous base.

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