Heat-killed virulent bacteria Live non- encapsulated nonvirulent Mixture bacteria of heat-killed Mouse dies virulent and live nonvirulent bacteria (d)
Live nonvirulent bacteria DNA isolated from heat-killed virulent bacteria transformed Live non- encapsulated nonvirulent bacteria Encapsulated virulent bacteria Mouse dies
1 夏F用 3 - 百黄一五 “三用 四1肥r情o
Watson and Crick Test 水化DNA纤维的X光行射图，十字交叉是双螺旋的特征，强弧 形是3.4A碱基对堆集的特征
Watson and Crick Test 水化DNA纤维的 X光衍射图，十字交叉是双螺旋的特征，强弧 形是3.4Å碱基对堆集的特征
I3.4A Minor groove Major 36A groove 20A (a) (b (c)