Pneumacoccustyp Infe cton of mice use dies 1.2 DNA is the no oth bateria genetic material Heat- kiled smooth ba cteria mouse in es rough bade ria Mixture of Heat-kiled Cs smo oth ba dera rough bacteria Dead mouse has lie smo oth bacteria Figure 1.2 The transforming Extrad DNA M principle Is DNA Add to Iwe rough bateria ■■ 消当 Tran sformationFigure 1.2 The transforming principle is DNA. 1.2 DNA is the genetic material