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Each spiral strand, composed of a sugar phosphate backbone and attached bases, is connected to a complementary strand by hydrogen bonding (non- covalent) between paired bases, adenine (A) with thymine (T) and guanine (G) with cytosine (C).
DNA
Adenine and thymine are connected by two hydrogen bonds (non-covalent) while guanine and cytosine are connected by three
DNA is made up of subunits which scientists called nucleotides. Each nucleotide is made up of a sugar, a phosphate and a base.
The number of purine bases equals the number of pyrimidine bases The number of adenine bases equals the number of thymine bases The number of guanine bases equals the number of cytosine bases
