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【单选题】
蛋白质二级结构中通常不存在的构象是
A.
α螺旋
B.
β折叠
C.
β转角
D.
无规卷曲
E.
α转角
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A.
容量大
B.
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C.
保密性好
D.
适应力强
E.
体积小、质量轻
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A.
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B.
错误
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A.
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B.
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A.
传输容量大
B.
重量轻
C.
损耗小
D.
以上均是
【判断题】背书可以附有条件。
A.
正确
B.
错误
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