Three kinds of DNA extracted from wheat,carp andλ-phage incubate withnaphthy1-fast RR mixture in 37℃,respectively. The result obtained shows that naked DNAhas some activity which could decompose naphthyl acetate. It supports Wang’s discoveryabout DNA’s catalytic activity in Phascolus aureus.Several problems about testing DNA’scatalytic activity and the important significance of study on...