细菌通过性菌毛相互连接沟通，将遗传物质从供体菌转移给受体菌
A．接合B．转化C．转导D．溶原性转换E．原生质体融合
参考答案：A
The boys in my class often _____ basketball on the playground after school.[ ]
A. play
B. plays
C. played
D. are playing
正常成年人血清乳酸脱氢酶(LDH)同工酶电泳结果
A．LDH2＞LDH1＞LDH3＞LDH4＞LDH5B．LDH5＞LDH1＞LDH2＞LDH3＞LDH4C．LDH3＞LDH1＞LDH2＞LDH4＞LDH5D．LDH1＞LDH2＞LDH3＞LDH4＞LDH5E．LDH4＞LDH1＞LDH2＞LDH3＞LDH5
