mRNA的二级结构如何调控翻译起始

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问题:

mRNA的二级结构如何调控翻译起始

考点:普通考研07理学分子生物学
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在会计核算中产生权责发生制和收付实现制两种记账基础的会计基本假设是( )。

A.会计分期假设

B.会计主体假设

C.货币计量假设

D.持续经营假设

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阅读下列材料

       材料一 “中国文武制度,事事远出两人之上,独火器万不能及。……中国欲自强,则莫如学习外国利器,欲学习外国利器,则莫如觅制器之器,师其法,而不必尽用其人。” ——《江苏巡抚李鸿章致 * * 衙门原函》

       材料二 梁启起在《变法通义》中叙述了同治初年德相俾斯麦的一段话为“三十年后,日本其兴,中国其弱乎?日人游欧洲者讨论学业,讲究官制,归而行之;中人之游欧洲才,询某厂船炮之利,某长价值之廉,购而用之,强弱之源,其在此乎”?

(1)材料一和材料二分别代表了哪一政治派别的什么思想?

                                                                                                                                                              

                                                                                                                                                              

(2)这两大政治派别为了挽救国家的危亡先后开展了什么运动?结果如何?

                                                                                                                                                              

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Historians have only recently begun to note the increase in demand for luxury goods and services that took place in eighteenth-century England. MeKendrick has explored the Wedgewood Firm’s remarkable success in marketing luxury pottery. Plumb has written about the proliferation of provincial theaters, musical festivals and children’ s toys and books. While the feat of this consumer revolution is hardly in doubt, three key questions remain : Who were the consumers What were their motives And what were the effects of the new demand for luxuries

An answer to the first of these has been difficult to obtain. Although it has been possible to infer from the goods and service actually produced what manufacturers and servicing trades thought their customers wanted, only a study of relevant personal documents written by actual consumers will provide a precise picture of who wanted what. We still need to know how large this consumer market was and how far down the social scale the consumer demand for luxury goods penetrated. With regard to this last question, we might note in passing that Thompson, while rightly restoring laboring people to the stage of eighteenth-century English history, has probably exaggerated the opposition of these people to the inroads of capitalist consumerism in general: for example, laboring people in eighteenth-century England readily shifted from home-brewed beer to standardized beer produced by huge, heavily capitalized urban breweries.

To answer the question of why consumers became so eager to buy, some historians have pointed to the ability of manufacturers to advertise in a relatively uncensored press. This, however, hardly seems a sufficient answer. MeKendriek favors a Viable model of conspicuous consumption stimulated by competition for status. The " middling sort" bought goods and services because they wanted to follow fashions set by the rich. Again, we may wonder whether this explanation is sufficient. Do not people enjoy buying things as a form of self-gratification If so, consumerism could be seen as a product of the rise of new concepts of individualism and materialism, but not necessarily of the frenzy for conspicuous competition.

Finally, what were the consequences of this consumer demand for luxuries MeKendriek claims that it goes a long way toward explaining the coming of the Industrial Revolution. But does it What, for example, does the production of high-quality potteries and toys have to do with the development of iron manufacture or textile mills I t is perfectly possiMe Go have the psychology and reality of consumer society without a heavy industrial sector.

That future exploration of these key questions is undoubtedly necessary should not, however, diminish the force of the conclusion of recent studies: the insatiable demand in the tenth-century England for frivolous as well as useful goods and services foreshadows our own world.

The author uses the example in the end of Paragraph 2 to()

A. illustrate that laboring people were ignored

B. illustrate that laboring people also had great consumptive power

C. predict that laboring people would always shift to capital urban breweries

D. explain why capitalists had such great consumptive power

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下列哪项外来因素不会使化学物品引起燃烧、爆炸、腐蚀、灼伤、中毒等灾害事故()。

A.受热

B.放置阴凉处

C.撞击

D.日光曝晒

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某项目部承接一项直径为4.8m的隧道工程,起始里程为DKlO+100,终点里程为DKl0+868,环宽为l.2m,采用土压平衡盾构施工。盾构隧道穿越地层主要为淤泥质黏土和粉砂土。项目施工过程中发生了以下事件:

事件1:盾构始发时,发现洞门处地质情况与勘察报告不符,需改变加固形式。加固施工造成工期延误10d,增加费用30万元。

事件2:盾构侧面下穿一座房屋后,由于项目部设定的盾构土仓压力过低,造成房屋最大沉降达到50mm。穿越后房屋沉降继续发展,项目部采用二次注浆进行控制。最终房屋出现裂缝,维修费用为40万元。

事件3:随着盾构逐渐进入全断面粉砂地层,出现掘进速度明显下降现象,并且刀盘扭矩和总推力逐渐增大,最终停止盾构推进。经分析为粉砂流塑性过差引起,项目部对粉砂采取改良措施后继续推进,造成工期延误5d,费用增加25万元。

区间隧道贯通后计算出平均推进速度为8环/d。

事件1、2、3中,项目部可索赔的工期和费用各是多少?说明理由。

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