一个多肽链含有150个氨基酸残基，其中60%呈α-螺旋，其余为β-折

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问题问答题简答题

一个多肽链含有150个氨基酸残基，其中60%呈α-螺旋，其余为β-折叠结构，此多肽链总长度最长是多少？

答案

参考答案：

150×0.6×0.15+150×（1-60%）×0.35=34.5（nm）

单项选择题

甲乙约定，甲的儿子考上大学后，则将甲儿子现在住的房间出租给乙，则此合同属于 ( )。

A．附生效条件的合同
B．附解除条件的合同
C．附生效期限的合同
D．附终止期限的合同

改错题

短文改错。

As the world enters the 21st century , the development in the science and technology will bring us

much more new hopes and chances we've never imagined before .People are hoping have a peacefully

and highly developed world .To catch up with the new development and to be success in the new

century, the younger generation is required to have different kind of skills and abilities ,such like the

computer science and the English language .Otherwise one will be leaving behind .Young people

should study even hard at school and prepare themselves mentally and physically to meet with the

challenge of the new century .

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