DNA链上鸟嘌呤被腺嘌呤取代,此种突变称为()
A.转换
B.错义突变
C.同义密码
D.颠换
E.无义密码
参考答案:A
分光光度计使用的光电倍增管,负高压越高灵敏度就越高。()
Towlines should be inspected for chafing where the towline().
A.passes over the stern of the towing vessel
B.passes through chocks
C.is attached to the disabled vessel
D.All of the above