A.103拷貝/ml B.104拷貝/ml C.102拷貝/ml D.105拷貝/ml
A.Friderick Griffith B.Alfred Hershey C.Martha Chase D.Oswald Avery
A.核苷的結(jié)構(gòu) B.磷酸二酯鍵 C.堿基順序 D.核苷酸的結(jié)構(gòu)