题干

下列关于cDNA文库和基因组文库的说法中,不正确的是(   )

A:cDNA文库中只含有某种生物的部分基因,基因组文库中含有某种生物的全部基因

B:如果某种生物的cDNA文库中的某个基因与该生物的基因组文库中的某个基因控制的性状相同,则这两个基因的结构也完全相同

C:cDNA文库中的基因都没有启动子

D:一种生物的cDNA文库可以有许多种,但基因组文库只有一种

上一题 下一题 0.0难度 选择题 更新时间:2018-02-07 11:19:31

答案(点此获取答案解析)

B

同类题4

阅读材料,完成下列要求。

材料一:儒学是中国传统文化的主干,是中国古代社会的主流意识形态。对中国国家的稳定和经济的发展提供了有利条件。可是,到了近代,儒学却连连遭到批判,其地位和影响不断削弱、衰微,最终失去主流、统治地位,被边缘化。这是中国儒学发展、演变史上的一个重要转折……儒学的衰微其实是中国近代社会变革、社会转型和文化革新、文化转型的必然结果。这一过程与中国近代化的展开、古代社会的解体基本同步,其历史必然性不言而喻。不同性质的社会变革一旦在中国展开,文化革新就相应提上了日程,就势必要不断触动传统儒学,以致最终否定它的神圣地位。在变革过程中,中国古代社会结构逐步解体,儒学也势必随之同步衰微。

——张锡勤《儒学在中国近代的命运》

材料二:韩国是一个善于学习的民族,……到了现代,他们一方面提倡世界化(实际是向美国看齐的现代化),另一方面又保护和弘扬以儒家文化为主体的中国传统文化。后者做得甚至比中国还好。从小到集体的人与人之间,大到国家的爱国主义精神支柱,每一步都渗透着儒家文化的传统素质。以儒家精神为基础的韩国人精神及其思维模式,还强调人在社会中的关系,“群体内的和谐”与“群体外的竞争”密切结合,使得韩国国内稳定不乱,又能在国际经济发展中大显身手,促使其综合国力名列前茅。

——《中国儒家传统文化对韩国社会发展的影响》

同类题5

阅读理解

    Amazon is breaking into physical retail(零售) in a new way. The online retail giant revealed a new kind of physical store concept in a video published on Monday.

    The store, called Amazon Go, doesn't work like a typical Walmart or supermarket. Instead, it's designed so that shoppers will use an app, also called Amazon Go, to automatically add the products that they plan to buy to a digital shopping cart by scanning a QR code. They can then walk out of the building without waiting in a checkout line because Amazon will charge their Amazon account and send them a receipt(收据).

    The first Amazon Go store is located in Seattle, where Amazon is headquartered. For years, there have been rumors the e­commerce company would expand its dominance(主导地位) from digital to physical shopping. Amazon began experimenting with physical bookstores a year ago, but Amazon Go may mark its boldest(大胆的) bet on physical ones yet. By removing much of the staff needed to operate a store, Amazon keeps costs lower than traditional competitors. It's also in a strong position to bring together data on its customers' shopping habits online and offline to make better suggestions in all situations.

    However, the company could be thought of as being a threat to some of the 3.4 million Americans who work as cashiers, according to the Bureau of Labor Statistics. And Donald Trump repeatedly criticized Amazon and its founder Jeff Bezos, “He's using the Washington Post for power so that the politicians in Washington don't tax Amazon like they should be taxed.”

    “Four years ago we asked ourselves: what if we could create a shopping experience with no lines and no checkout? Could we push the boundaries of computer vision and machine learning to create a store where customers could simply take what they want and go?” The company says on an informational page about Amazon Go. For now, Amazon is starting slow. The Amazon Go is only open to Amazon employees in our Beta program, and is scheduled to open to the public in 2017.