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They were up very late because [A]it was Sunday morning [ B ] they were not very sleepy [C] they were preparing for the dinner [D] they saw the great fire start
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【单选题】关于蛋白质三级结构叙述错误的是__。
A.
天然蛋白质分子均具有这种结构
B.
三级结构包括主链和侧链的空间排布
C.
具有三级结构的多肽都具有生物学活性
D.
亲水性氨基酸多聚集在三级结构表面
【单选题】Global warming may cause some natural disasters such as wild fire and drought to become more severe.
A.
Y
B.
N
C.
NG
【单选题】请阅读Passage 2，完成第小题。 Global warming may or not be the great environmental crisis of the 21st century， but regardless of whether it is or not， we won't do much about it. We will argue over it and may ev...
A.
It may not prove an environmental crisis at all.
B.
It is an issue requiring worldwide commitments.
C.
Serious steps have been taken to avoid or stop it.
D.
Very little will be done to bring it under control.
【单选题】关于蛋白质三级结构叙述错误的是
A.
具有三级结构的多肽链均有生物学活性
B.
亲水基团多位于三级结构表面
C.
三级结构的稳定性主要由次级键维系
D.
疏水作用属于次级键
E.
结构域属于三级结构
【单选题】Global warming may also give rise to the spread of many infectious diseases.
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】18世纪70年代，有一位英国医生发现： ①烟囱清洁工中患皮肤癌的人多的让人不可思议。 ②经常洗澡的清洁工比极少洗澡的清洁工得病的几率小的多。 (1)根据这位医生发现的事实推测，导致烟囱清洁工得皮肤癌的原因是____________。 (2)为了验证你的假设，可以进行动物实验，实验处理是：实验组：在动物的皮肤上每天定期涂抹__________；对照组，对动物的皮肤___________。一段时间后检...
【单选题】关于蛋白质三级结构叙述错误的是
A.
具有三级结构的多肽链都有生物活性
B.
疏水侧链常分布于分子内部
C.
三级结构的稳定主要靠次级键
D.
三级结构是单体蛋白质或亚基的空间构象
E.
三级结构是整条肽链所有原子在三维空间的排布位置
【单选题】Lomborg argues that global warming______.
A.
may be something beneficial to human beings
B.
should be addressed by environmental scientists
C.
has ignited a heated controversy among scientists
D.
is important both statistically and environmentally
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