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【单选题】
一个人全部理想的归宿和基础是A.
职业理想
B.
科学理想
C.
社会理想
D.
道德理想
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举一反三
【单选题】关于蛋白质二级结构α-螺旋的叙述正确的是
A.
天然的蛋白质都是右手α-螺旋
B.
多聚Lys和多聚Ile因为空间位阻效应而不能形成α-螺旋
C.
维持α-螺旋的作用力主要是肽键
D.
α-螺旋中，每个氨基酸残基的羰基氧与前面第四个氨基酸残基的亚氨基氢形成氢键
【单选题】下列有关蛋白质α-螺旋的叙述，正确的是( )。
A.
属于蛋白质的三级结构
B.
由二硫键构成，起稳定作用
C.
由盐键构成，起稳定作用
D.
多为右手螺旋，3．6个氨基酸残基升高一圈
【简答题】A．It's a strange thing. B．Someone has come to see me. C．I feel very surprised at the news. D．There was an accident on the road.
【单选题】It's one thing if a scientific experiment goes wrong in a lab, they say, but something else entirely if it winds up on your dinner plate.
A.
appears in the end
B.
annoys
C.
blows away
D.
moves upwards
【单选题】关于蛋白质二级结构α-螺旋的叙述正确的是
A.
天然的蛋白质都是右手α-螺旋
B.
多聚Lys和多聚Ile因为空间位阻效应而不能形成α-螺旋
C.
维持α-螺旋的作用力主要是肽键
D.
α-螺旋中，每个氨基酸残基的羰基氧与前面第四个氨基酸残基的亚氨基氢形成氢键
【单选题】It's one thing... but something else entirely if it winds up on your dinner plate.
A.
appears in the end
B.
annoys
C.
blows away
D.
moves upwards
【简答题】Time to Dance Are you the kind of person who likes to move with music? It's a natural thing to do. Even little children start jumping up and down when they hear music. Scientists say that animals danc...
【简答题】阅读短文，选择最佳选项。 Many British people like to go bird-watching in their free time. That's why there are many English sayings about birds. Read the following to learn about them. He eats like a bird. This d...
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