在位置比较接近的氨基酸残基之间α螺旋是靠什么键维系()。
A. 肽键
B. 氢键
C. 糖苷键
D. 磷酸酯键
E. 3’.5’一磷酸二酯键
For some young people， the needless garage__________．
A. is rented by them to make money
B. is seen as a choice of accommodation
C. is perfect to store music instruments
D. is an ideal place to freely host parties
The survey of more than 5，000 women with engineering degrees implies that __________．
A. it is easy for men to solve the engineering problems
B. it is difficult for women to graduate from top universities
C. men are liable to choose engineering as their university major
D. it is difficult for women to survive the field of engineering
多肽链中氨基酸的种类和排列顺序是由什么决定的()。
A. 操纵基因
B. 调节基因
C. 结构基因
D. 假基因
E. 启动子
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