题目内容

一般而言,分子量小的蛋白质更不稳定,其原因是( )。

A. 分子量越小,形成良好空间构象的可能性越低
B. 分子量越小,表达效率越高
C. 分子量越小,分泌效果越佳
D. 分子量越小,形成多聚体的概率越大

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利用DNA同源重组技术人们可以( )。

A. 灭活基因
B. 表达基因
C. 复制基因
D. 纯化基因

在一个请求分页存储管理的系统中,一个程序的页面走向为 6,0,1,2,0,3,0,4,2,3,分别采用最佳置换算法、先进先出置换算法、最近最久未使用算法,完成下列要求。设分配给该程序的存储块数 M=3,每调进一个新页就发生一次缺页中断,计算每个算法的缺页率(辽大模拟)。

某作业占有7个页面,如果在主存中只允许装入4个工作页面(即工作集为4),作业运行时,实际访问页面的顺序是:1, 2, 3, 6, 4, 7, 3, 2, 1, 4, 7, 5, 6, 5, 2, 1。试计算采用FIFO和LRU,分别列出各自的页面淘汰顺序和页面置换次数。

A confrontF campaignK releasedB protectG availableL admittedC expelledH satisfactoryM careerD acceptedI preventN extensiveE pressureJ browseO affirmativePlagiarizing, copying a peer's test answers, and buying essays online are all ways in which collegestudents cheat. According to a survey, nearly 80% of the students interviewed 1)____ cheating at some point during their educational 2)_______. The consequences are severe (严重的),ranging from a failing grade to being 3)_____ from college. But why do students cheat? In college, the ______ to do well is very high. Students know that without 5)____ potential for success at school would be limited,so they sometimes copy their peers' answers in the exam. Besides, with today's technology, thereis more information 6)______ before. Students don't have to 7)______ Internet long to find essays for sale. These are just some of the reasons why college students might cheat. Although colleges doeverything they can to 8)_____ cheating, it still goes on. And cheating becomes more 9)_____ in some schools. But students should think about the consequences they will 10)_______.They should stop and think about how happy and proud they will be when they earn a good grade in an honest way.

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