Ch10: They discovered that within each species, there is some regularity in the ratios of the bases: the amount of adenine is always equal to the amount of thymine (A = T), and the amount of guanine is always equal to the amount of cytosine (G = C) (Table 10.1). These findings became known as Chargaff’s rules. p.296

Chargaff's rule: G=C & A=T

Ch10: He discovered that DNA consists of a large number of linked, repeating units, called nucleotides; each nucleotide contains a sugar, a phosphate, and a base. p.296

Nucleotide is made up of three components: sugar, phosphate, and base