为了把噬菌体附着位点(attP)和在细菌染色体上的附着位点(attB)结

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问题判断题

为了把噬菌体附着位点(attP)和在细菌染色体上的附着位点(attB)结合重组起来，λ噬菌体DNA在感染大肠杆菌后靠末端cos位点退火成环。 ( )

答案

参考答案：对

选择题

Have you seen Jack recently? I wonder ______ with his classmates.

A．how is he getting along

B．that he is getting along well

C．what he is getting along

D．if he is getting along well

判断题

气门挺杆磨损会使气门脚间隙变大。