题目内容

DNA的Tm值随（A+T）/（G+C）比值的增加而增加。（）

A. 对
B. 错

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mRNA上密码子为pCAG，则与之对应的tRNA上反密码子为pATG。（）

A. 对
B. 错

He put the big box down on the floor, _ (breathe) heavily and ___ (look) exhausted.

________ (consider) the importance of the experiment, they checked the result again and again.

This same thing, _________ (happen) in the peace time, would be a great disaster.