[单选题]β折叠结构中,折叠链片段通过()相互结合。A . 氢键B . 离子键C . 肽键
[单选题]H.elen Keller is remembered as ______.A. a political leader.B. an example to others.C. a famous scientist.D. an extraordinary doctor.
[单选题]H.elen Keller learnt to ______.A. care for children.B. express hersel.C. travel alone.D. use her physical strength.
[单选题]Keller-Kiliani反应是A.硫酸阿托品鉴别试验B.维生素C鉴别试验C.地西泮鉴别试验D.地高辛鉴别试验E.苯巴比妥鉴别试验
[单选题]li链的主要功能是A.促进MHCⅡ类分子α链与β链组装和折叠B.促进MHCⅡ类分子二聚体形成C.位于粗面内质网膜上D.促进MHCⅡ类分子在粗面内质网内与其他内源性多肽结合E.促进MHCⅡ类分子二聚体在细胞内的转运
[单选题]Passage FiveH.elen Keller was born a healthy normal child in Alabama in 1880. However, an illness with a high fever struck her when she was still a child. She became deaf, blind, and unable to speak. For little Helen, the world was suddenly a dark an
[问答题] 试述波特的价值链模型。
[单选题]模型数据链用来实现模型库和()之间的接合。A . 模型库B . 外部环境C . 内部环境D . 数据库
[单选题]What was Helen Keller like when Miss Sullivan met her?A. She was quiet and shy.B. She was bright and friendly.C. She was weak from illness.D. She was uncontrollable.