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
Mothers interfere with their children’s lives even more than most offspring realize. That they nag about eating habits is well k
Mothers interfere with their children’s lives even more than most offspring realize. That they nag about eating habits is well k
admin
2017-04-13
52
问题
Mothers interfere with their children’s lives even more than most offspring realize. That they nag about eating habits is well known. What goes unnoticed is that mothers leave cells inside their children’s bodies, which may help with repairs when a child’s own cells go disorderly.
This form of maternal interference is called microchimerism—the presence of a small number of cells that originate from another individual and therefore genetically distinct from the cells of the host individual. A mother’s cells can endure until a child reaches adulthood and perhaps throughout life. But scientists do not know exactly how common microchimerism is. It is detected more often in people with autoimmune conditions, which has led to the suggestion that the maternal cells could trigger those diseases. But healthy people have them too, seemingly with no ill effects.
Lee Nelson, of the University of Washington, suspects that everybody has a few maternal cells. Her most recent work argues that, at least in some cases, they help rather than harm. Dr Nelson and her colleagues took blood samples from three groups of young volunteers and their mothers. The first group comprised 94 young volunteers who had type 1 diabetes; the second were 54 of their healthy siblings(brothers or sisters); and a further 24 were children without diabetes who were not related to anyone else in the study. The researchers then compared DNA from the mothers and their children.
Because mothers pass copies of about half their genes to their children, some genes in any child-mother pairs will be unique to the mother—those that the child has not inherited from her. Others—versions of genes that came from dad—will be unique to the child. Dr Nelson used the uniquely maternal genes to find mothers’ cells in the volunteers’ blood. The technique found maternal cells in about half the diabetics’ samples, but in only about one-third of the healthy siblings’ samples and in less than one-fifth of those from the unrelated volunteers. Moreover, the microchimerism was not only more common but also more pronounced in diabetics.
Dr Nelson also looked for signs that the maternal cells had caused the diabetes but found no evidence. So, contrary to established opinion, she believes maternal cells can do children good. These cells may help any bodily organ work better, she says, apart from the reproductive kind. Mothers’ protective interference goes on—seen and unseen.
It is stated in Paragraph 2 that microchimerism could
选项
A、only be detected in people with autoimmune conditions.
B、be found in people of all ages and of all races.
C、also be found in people who enjoy good health.
D、be detected in people with all unhealthy conditions.
答案
C
解析
事实细节题。根据第二段最后一句话“健康人的体内也有母血细胞,却似乎并没有引发什么不良后果”,可得出答案为C项。
转载请注明原文地址:https://kaotiyun.com/show/ymbZ777K
0
考研英语一
相关试题推荐
Bankershavebeenblamingthemselvesfortheirtroublesinpublic.Behindthescenes,theyhavebeentakingaimatsomeoneelse;
ThreedaysagoyousentyourIDcardtoyourparentsthroughS.F.Express,withthepromiseofnext-daydelivery.However,the
Themade-for-TVmovieaboutatornadocarryingman-eatingsharkswasasurprisehitinAmerica.ThepreposterousplotofSharkna
Thereweresomeconsistentpatternsamongtheheavierreaders:Fortheyoungerchildren—ages6to11—beingreadaloudtoregula
Thereweresomeconsistentpatternsamongtheheavierreaders:Fortheyoungerchildren—ages6to11—beingreadaloudtoregula
LastweekIhadlunchwithamanwhousedtobeoneofthemostseniorbankersintheUK.Thetroublewithbusinesstoday,heco
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
Insomniacs(someonewhocannotsleepeasily)don’tjustsufferatnight.Duringtheday,theyoftenfeelsleepy,havetroubleco
随机试题
Purkinjefiber
即使笔试成绩优秀的考生,对于面试也有心理压力,毕竟面试形式多样,考官提问出其不意,所以,面试对考生是有挑战性的。虽然,绝对不可能有万无一失的应试方法,但是,下面的一些建议可以帮助你提高应试能力,增加成功可能性。由此可推知下面的内容是关于(
永磁式测速发电机的转子是用永久磁铁制成的。()
总分类账户期末余额应与所属明细分类账户期末余额合计数相等。()
某公司有一台设备,购于两年前,现在考虑是否需要更新。该公司所得税率为25%,要求的最低投资报酬率为10%,如果更新,每年可以增加销售收入100万元,有关资料见下表(单位:万元)。按照税法规定,旧设备采用双倍余额递减法计提折旧,新设备按照年数总和法计提折
再认或回忆过程中的情绪情感状态是决定再认或回忆效果的最重要的因素。()
学习型组织理论是新古典组织理论的一种。()
设f(x,y)在(0,0)的某邻域内连续,且满足=一3,则f(x,y)在(0,0)处().
Overthelastdecade,demandforthemostcommoncosmeticsurgeryprocedures,likebreastenlargementsandnosejobs,hasincrea
Thecentralproblemofeconomicsistosatisfythepeople’sandnation’swants.Theproblemwearefacedwithisthatour【C1】___
最新回复
(
0
)