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【多选题】
下列哪几种突变最可能是致命的( )。A.
腺嘌呤取代胞嘧啶
B.
胞嘧啶取代尿嘧啶
C.
缺失三个核苷酸
D.
插入二个核苷酸
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举一反三
【简答题】Knudson提出模型:产生癌细胞需要( )级变异。眼癌的产生来自( )个遗传缺陷。通常为一只眼癌变,这只眼中的细胞经过( )次突变。
【简答题】若要在当前目录下创建一个目录A,同时在A目录下创建子目录B,正确的命令是( )
【简答题】Many children like to go to the zoo 31 their parents on 32 . In the zoo, there are many 33 , like elephants, pandas, monkeys, tigers and 34 animals. 35 only live in China. I like them very much. They ...
【单选题】______, the short is in some ways not really new.
A.
Like many another new things
B.
Like much other new things
C.
Like many other new things
D.
Like many another new thing
【简答题】Many persons like listening to it.
【简答题】Many people like the feeling of the gentle wind in spring. Many like to see the falling leaves dancing in the wind in autumn. But sometimes, when the wind becomes a storm, it can be very destructive (...
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