首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
Lonely people, it seems, are at greater risk than the gregarious of developing illnesses associated with chronic inflammation, s
Lonely people, it seems, are at greater risk than the gregarious of developing illnesses associated with chronic inflammation, s
admin
2019-06-11
42
问题
Lonely people, it seems, are at greater risk than the gregarious of developing illnesses associated with chronic inflammation, such as heart disease and certain cancers. A paper published last year in the Public Library of Science, Medicine, shows the effect on mortality of loneliness is comparable with that of smoking and drinking after examining the results of 148 previous studies and controlled for factors such as age and pre-existing illness.
Steven Cole of the University of California, Los Angeles, thinks he may know why this is so. He told the American Association for the Advancement of Science meeting in Washington, D.C., about his work studying the expression of genes in lonely people. Dr. Cole harvested samples of white blood cells from both lonely and gregarious people. He then analysed the activity of their genes, as measured by the production of a substance called messenger RNA. This molecule carries instructions from the genes telling a cell which proteins to make. The level of messenger RNA from most genes was the same in both types of people. There were several dozen genes, however, that were less active in the lonely, and several dozen others that were more active. Moreover, both the less active and the more active gene types came from a small number of functional groups.
Broadly speaking, the genes less active in the lonely were those involved in staving off viral infections. Those that were more active were involved in protecting against bacteria. Dr. Cole suspects this could help explain not only why the lonely are iller, but how, in evolutionary terms, this odd state of affairs has come about.
The crucial bit of the puzzle is that viruses have to be caught from another infected individual and they are usually species-specific. Bacteria, in contrast, often just lurk in the environment, and may thrive on many hosts. The gregarious are therefore at greater risk than the lonely of catching viruses, and Dr. Cole thus suggests that past evolution has created a mechanismwhich causes white cells to respond appropriately. Conversely, the lonely are better off ramping up their protection against bacterial infection, which is a bigger relative risk to them.
What Dr. Cole seems to have revealed, then, is a mechanism by which social environment reaches inside a person’ s body and tweaks its genome so that it responds appropriately. It is not that the lonely and the gregarious are genetically different from each other. Rather, their genes are regulated differently, according to how sociable an individual is. Dr. Cole thinks this regulation is part of a wider mechanism that tunes individuals to the circumstances they find themselves in.
Broadly speaking, the genes more active in the lonely
选项
A、helped to avoid infections resulting from viruses.
B、participated in guarding against bacteria.
C、came from a few different functional groups.
D、existed only as a small group.
答案
B
解析
细节题。根据题干信息定位到第三段的前两句。这两句讲述孤独的人体内活性较低的基 因是那些帮助人们避开病毒感染的基因。而那些活性较高的基因帮助人们抵抗细菌,因此答案 为B项。文中提到避开病毒感染的基因是孤独的人体内活性较低的基因,故排除A项。第二段 末句说无论是活性较高的基因还是活性较低的基因都来自少数功能群,与C项矛盾。D项在原 文未提及,故排除。
转载请注明原文地址:https://jikaoti.com/ti/ZrH7FFFM
0
考研英语一
相关试题推荐
CigarettesmokingisahealthhazardofsufficientimportanceintheUnitedStatestowarrantappropriateremedialaction.Itwa
Speakingtwolanguagesratherthanjustonehasobviouspracticalbenefits.Inrecentyears,scientistshavebeguntoshowthat
AsformercolonistsofGreatBritain,theFoundingFathersoftheUnitedStatesadoptedmuchofthelegalsystemofGreatBritai
AsformercolonistsofGreatBritain,theFoundingFathersoftheUnitedStatesadoptedmuchofthelegalsystemofGreatBritai
GooglealreadyhasawindowintooursoulsthroughourInternetsearchesanditnowhasinsightintoourailingbodiestoo.The
GooglealreadyhasawindowintooursoulsthroughourInternetsearchesanditnowhasinsightintoourailingbodiestoo.The
GooglealreadyhasawindowintooursoulsthroughourInternetsearchesanditnowhasinsightintoourailingbodiestoo.The
GooglealreadyhasawindowintooursoulsthroughourInternetsearchesanditnowhasinsightintoourailingbodiestoo.The
"Projectgold"and"ProjectNexus"soundlikeplansforbankrobberiesormilitaryattacks.Inreality,theyarethenamesforK
随机试题
肝与胆发生的描述,正确的是()
赛马,障碍赛时摔倒,左前肢支跛明显,前臂上部弯曲,他动运动有骨摩擦音,患部肿胀,未见皮肤损伤,全身症状不明显。本病的确诊方法是
西周时期,在审理案件过程中判断当事人陈述真伪的五种方式被称为()。
“恶臭污染物厂界标准值”中的臭气浓度的单位是()。
下列输送设备中,属于无挠性牵引的输送设备是()。
层层关卡,没有堵住问题洋奶粉流向市场,这暴露出我国食品安全监管的缺位和割裂。专家认为,食品安全生产和监督都容不得一丁点的侥幸心埋。企业、监管部门都应该有“守门”意识,出了问题捂着、掖着,只会带来市场信任和政府公信力的丧失。这段文字中的“守门”主要是指企业和
事务的(58)________________是指事务一旦提交,即使之后又发生故障,对其执行的结果也不会有任何影响。
使用VC++2010打开考生文件夹下blank1中的解决方案。此解决方案的项目中包含一个源程序文件blank1.c。在此程序中,函数fun的功能是:求ss所指字符串数组中长度最短的字符串所在的行下标,作为函数值返回,并把其串长放在形参n所指的变量中。ss所
Likemostpeople,I’velongunderstoodthatIwillbejudgedbymyoccupation,thatmyprofessionisagaugepeopleusetoseeh
CanBurglarsJamYourWirelessSecuritySystem?A)Anyproductthatpromisestoprotectyourhomedeservescarefulexamination.S
最新回复
(
0
)