试题与答案

DNA模板链的碱基组成是C=28.5%、 C=12.8%、A=30.6%、T=28.

题型:单项选择题

题目:

DNA模板链的碱基组成是C=28.5%、 C=12.8%、A=30.6%、T=28.1%,这条链转录成mRNA的碱基组成是

A.A=28.1%、G=12.8%、C= 28.5%、T=30.6%
B.A=28.1%、G=28.5%、C= 12.8%、T=30.6%
C.A=30.6%、G=28.5%、C= 12.8%、U=28.1%
D.A=28.1%、G=28.5%、C= 12.8%、U=30.6%
E.以上都不对

答案:

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题型:单项选择题

日本工厂的工人享有终身工作的保证,还拥有以生产率和公司利润为基础的奖金和不与特定工作相联系的丁资。相矛盾的是,这些保障没有打击工厂旨在进行节省劳动力的机器更新的信心。这些革新对工厂主有利,尽管事实上工厂主必须保证他们工人的工资。
下面哪一项如果是正确的,合理地解释了为什么引进节省劳动力的机器对工厂有利( )

A.在一个日本工厂,工人被雇佣前必须提供以前生产率的纪录。

B.节省劳动力的机器增加生产率,因此产生的利润超过重新培训工人做其他工作的花费。

C.购买和维持新机器增加了产品的最终成本。

D.工厂工人要求改变他们所执行的日常工作的程序。

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