試題詳解

27. That the nature of genetic material is DNA is based on_______ .
(A) the transforming material is heat-unstable
(B) DNase digestion has no effects but RNase digestion can destroy the activity
(C) the base composition of DNA is constant from one species to another
(D) only DNA can enter the cell if E. coli is infected by T2 phage
(E) UV absorption maximum is at 280 nm