质粒:
参考答案:是核体以外的遗传物质,为环状闭合的双股DNA,带有遗传信息,控制细菌某些特定的遗传性状,能自我复制。
. Jim’s leg was ______ damaged in the accident. He now walks with a limp.
A.permanently
B.increasingly
C.virtually
D.deadly
感染性心内膜炎不具有的临床体征为()
A.皮肤黏膜瘀点
B.脾大
C.结节性红斑
D.贫血
E.杵状指