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【简答题】
植物从叶尖、叶缘分泌液滴的现象称为 ,其动力是 。
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皮皮学刷刷变学霸
举一反三
【单选题】多数情况下,突变多是()。
A.
体细胞突变
B.
有利的
C.
由显性基因变为隐性基因
D.
由隐性基因变为显性基因
【简答题】Task 2 You will hear five short dialogues. Listen to each of them and choose the best answer to it.
【单选题】关于蛋白质三级结构的描述错误的是:(    )
A.
有三级结构的多肽链都具有生物学活性    
B.
天然蛋白质分子均有这种结构
C.
三级结构的稳定性由多种次级键维系    
D.
亲水基团多分布在三级结构的表面
E.
决定盘曲折叠的因素是氨基酸序列
【单选题】What can we infer from the last paragraph of the article?
A.
The severely fat patients are threatened with potential illness.
B.
The diet-pills have been sold to all comers without discrimination.
C.
The diet-pills should not have been hailed as miraculous cures and then discarded as dangerous drugs.
D.
The diet-pills were intended to a short-term cure for the very fat.
【多选题】How can doctors work in partnership with patients?
A.
listen to patients and respond to their concerns and preferences
B.
give patients the information they want or need in a way they can understand
C.
respect patients' rights to reach decisions with you about their treatment and care
D.
support patients in caring for themselves to improve and maintain their health
【单选题】Task 2 You will hear eight short conversations. After each conversation, you should decide on the best answer from the four choices marked A, B, C and D.
A.
1,000 yuan.
B.
1,500 yuan.
C.
1,200 yuan.
D.
2,000 yuan.
【单选题】关于蛋白质分子三级结构的描述,其中错误的是
A.
具有三级结构的多肽链都具有生物学活性
B.
天然蛋白质分子均有这种结构
C.
三级结构的稳定性主要由次级键维系
D.
亲水基团多聚集在三级结构的表面
E.
决定盘曲折叠的因素是氨基酸残基及环境因素
【判断题】基因突变是可逆的,多数情况下正突变率高于反突变率。
A.
正确
B.
错误
【单选题】关于蛋白质分子三级结构的描述,错误的是(    )
A.
天然蛋白质分子均有这种结构
B.
具有三级结构的多肽链都具有生物学活性
C.
三级结构的稳定性主要是次级键维持
D.
亲水基团聚集在三级结构的表面
E.
决定盘曲折叠的因素是氨基酸残基
【单选题】史铁生在《秋天的怀念》中表达的是对谁的怀念( )
A.
祖母
B.
父亲
C.
母亲
D.
老师
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