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【单选题】
下列关于DNA甲基化的叙述,错误的是A.
甲基化程度越高,DNA的转录活性越低
B.
管家基因多处于甲基化状态
C.
当某些基因的功能完成之后,甲基化可能有助于这些基因的关闭
D.
甲基化直接干扰转录因子与启动子中特定的结合位点的结合
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】—I’m sorry I stepped on your foot; it was an accident. —It wasn’t! You did it ______________ .
A.
as usual
B.
on purpose
C.
at an end
D.
right away
【单选题】— I'm sorry !I broke the window of your car while I was playing football. — What? _____I really wanted to hit you. [ ]
A.
That couldn't be better.
B.
It does you good.
C.
I'm with you on that.
D.
You little rascal!
【简答题】查找商品的8位编码: 自动闭门器(铝合金制)( )
【简答题】铝合金制自动闭门器
【简答题】I'm playing football. (对画线部分提问) ______ ______you______?
【单选题】I'm good _____ football. _____ you play football well? [ ]
A.
at playing, Are
B.
at playing, Do
C.
in playing, Do
D.
in playing, Are
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