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
2017-12-11
41
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.
Dr. Cole made an analysis of the activity of the genes by
选项
A、measuring the level of messenger RNA.
B、calculating the number of more active gene types.
C、instructing the production of certain proteins.
D、comparing less active genes with more active ones.
答案
A
解析
细节题。根据题干信息定位到第二段的第三、四句。从这两句可知,Cole博士从孤独的 人和爱交际的人那里收集了白细胞样本,然后靠测量一种叫作信使RNA的物质的数量分析了 他们基因的活性,或者说通过测量信使RNA的含量来分析基因活性,故A项符合题意,为正 确答案。B项和D项在原文中没有提及,可排除。原文提到的是信使RNA携带者基因上的指 令,这些指令告诉细胞生产哪类蛋白质,显然这是对信使RNA的介绍,并不是分析基因活性的 方法,故C项“对生产某种蛋白质下达指令”错误。
转载请注明原文地址:https://kaotiyun.com/show/roBZ777K
0
考研英语一
相关试题推荐
ScientistshavediscoveredapowerfulantibioticinthebloodstreamofgiantpandasthatcandestroybacteriaTheChineseresea
【C1】______thewayitfeels,lonelinessoftenhasnothingtodowithbeingalone.Forsomepeople,feelingsof【C2】______aresharp
AsValentine’sDayapproaches,manysinglepeoplebegintofeelalittlesorryforthemselves.Onaday【C1】______bycouples,thi
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】______tothem,whetherfromChi
Britain’sprivateschoolsareoneofitsmostsuccessfulexports.Thechildrenofthewealthy【C1】______tothem,whetherfromChi
Weoftenattributekeycharacteristicstooneofourparents:"Hegetshisathleticismfromhisfather.""Herquicknesstoange
Niceguysknewit,nowtwostudieshaveconfirmedit:badboysgetthemostgirls.Thefindingmayhelpexplainwhyanastysuit
Whenoneofhisemployeesphonedinsicklastyear,ScottMcDonald,CEOofMonumentSecurityinSacramento,California.,decided
Datahasahabitofspreading.ItslipspastmilitarysecurityanditcanalsoleakfromWikiLeaks.Itevenslippedpasttheban
"Projectgold"and"ProjectNexus"soundlikeplansforbankrobberiesormilitaryattacks.Inreality,theyarethenamesforK
随机试题
当x→0时,与2x是等价无穷小量,则a=________.
在进行螺旋CT胰腺多期扫描时,胰腺实质期即门脉前期的延长时间是
具有清热除烦保津作用的药物是
患者男性46岁,口底多间隙感染,肿胀明显,可及捻发音及波动感,主诉呼吸困难,下列处理正确的是
患者死亡,医患双方当事人不能确定死因或者对死因有异议的,应当尸检,当地不具备尸体冻存条件的,尸检的期限是
【背景资料】建设单位与甲施工单位就某机电工程按照《建设工程施工合同(示范文本)》签订了施工合同。经建设单位同意,甲施工单位选择了乙施工单位作为分包单位。在施工过程中,甲施工单位的资金出现困难,无法按分包合同约定支付乙施工单位的工程款。乙施工单位向建设单
临时停市( )。
某企业今年计划生产一种产品,该产品单价为400元,单位产品的变动费用为150元,其固定成本为780万元,根据以上资料确定该企业今年产销量不赔的最低量是()。
两汉乐府诗主要保存在《乐府诗集》的_______、鼓吹曲辞、相和歌辞和杂歌谣辞中。
分析资本运动过程所经历的阶段及采取的形式,以阐明资本连续运动的条件及其矛盾是
最新回复
(
0
)