The previous studies explain that there are few women in STEM fields because__________．
A. women are unwilling to compete with men
B. women are better promoted in other fields
C. women are not as intelligent as men
D. women are not fond of such fields
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单核苷酸由核苷和磷酸缩合而成，其连接键为()。
A. 肽键
B. 氢键
C. 糖苷键
D. 磷酸酯键
E. 3’.5’一磷酸二酯键
What is the fmding of Nadya Fouad？ 查看材料
A. Women lack confidence in STEM fields．
B. Women just sacrifice their STEM work for family．
C. Women face a terrible work environment in STEM fields．
D. Women dare to challenge impolite colleagues in STEM fields．
核苷由戊糖和碱基缩合而成，其连接键为()。
A. 肽键
B. 氢键
C. 糖苷键
D. 磷酸酯键
E. 3’.5’一磷酸二酯键
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
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