试题与答案

试说明噬菌体作为基因工程载体的依据及其优点,并以凯隆载体为例加以说明。

题型:问答题 简答题

题目:

试说明噬菌体作为基因工程载体的依据及其优点,并以凯隆载体为例加以说明。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:DRIs是在RDAs基础上发展起来的一组每日平均膳食营养素摄入量的参考值,其中包括4项内容:平均需要量(EAR)、推荐摄入量(RNI)、适宜摄入量(AI)、可耐受最高摄入量(UL)

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题型:实验题

小强同学在做“用天平和量筒测盐水密度”的实验

(1)请完成以下实验要求:(4分)

(a)用天平称空烧杯的质量m1 = 63g

(b)往空烧杯中加入适量的盐水,用天平称烧杯和盐水总质量,天平平衡后右盘砝码总质量是140g ,游码位置如下图,则盐水的质量为_________g 。

(c)把烧杯的盐水全部到入量筒中,测得盐水体积为65cm3,则盐水的密度为____________kg / m3

(2)按上面实验方案会使测出盐水的密度有误差(4分)

(a)什么原因导致测出的盐水密度有误差?

(b)通过简单分析说明测出盐水密度是偏大还是偏小?

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题型:单项选择题

Questions 11-15 are based on Passage Three:Passage ThreeIf you know exactly what you want, the best route to a job is to get specialized training.A recent survey shows that companies like graduates in such fields as business and health care who can go to work immediately with very little on-the-job training.That’s especially true of booming fields that are challenging for workers. At Cornell’s School of Hotel Administration, for example, bachelor’s degree graduates get an average of four or five job offers with salaries ranging from the high teens to the low 20s and plenty of chances for rapid advancement. Large companies, especially, like a background of formal education coupled with work experience.But in the long run, too much specialization doesn’t pay off. Business, which has been flooded wjth MBAs, no longer considers the degree an automatic stamp of approval. The MBA may open doors and command a higher salary initially, but the impact of a degree washes out after five years.As further evidence of the erosion of corporate faith in specialized degrees, Michigan State’s Scheetz cites a pattern in corporate hiring practices, although companies tend to take on specialists as new hires, they often seek out generalists for middle and upper-level management. “They want someone who isn’t constrained by nuts and bolts to look at the big picture," says Scheetz.This sounds suspiciously like a formal statement that you approve of the liberal-arts graduate. Time and again labor-market analysts mention a need for talents that liberalarts majors are assumed to have: writing and communication skills, organizational skills, open-mindedness and adaptability, and the ability to analyze and solve probiems, David Birch claims he does not hire anybody with an MBA or an engineering degree, "I hire only liberal-arts people because they have a less-than-canned way of doing things," says Birch. Liberal-arts means an academically thorough and strict program that includes literature, history, mathematics, economics, science, human behavior-plus a computer course or two. With that under your belt, you can feel free to specialize, "A liberal-arts degree coupled with an MBA or some other technical training is a very good combination in the market-place," says Scheetz.

What kinds of people are in high demand on the job market ( )

A.Students with a bachelor’s degree in humanities

B.People with an MBA degree fr.ont top universities

C.People with formal schooling plus work experience

D. People with special training in engineering

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