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
69
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.
"Microchimerism" refers to a form of maternal interference in which mothers
选项
A、keep telling their children what they should eat all day long.
B、help sick children with their own cells left inside children’s bodies.
C、interfere with children’s lives in an all-round way.
D、leave all of their own cells, good or bad, inside their children’s bodies.
答案
B
解析
词义理解题。根据第二段第一句可得知对于microchimerism的解释应该在上一段中,因此通过第一段最后一句“当孩子的细胞出现问题时,从母亲那里继承来的细胞会对其进行修复”可得出答案为B项。
转载请注明原文地址:https://kaotiyun.com/show/fmbZ777K
0
考研英语一
相关试题推荐
Bankershavebeenblamingthemselvesfortheirtroublesinpublic.Behindthescenes,theyhavebeentakingaimatsomeoneelse;
Thereweresomeconsistentpatternsamongtheheavierreaders:Fortheyoungerchildren—ages6to11—beingreadaloudtoregula
LastweekIhadlunchwithamanwhousedtobeoneofthemostseniorbankersintheUK.Thetroublewithbusinesstoday,heco
Whatifsomeonecameupwithanewtechnologyproductthatwashailedasabreakthroughwiththepotentialtorivalthesmartpho
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
Insomniacs(someonewhocannotsleepeasily)don’tjustsufferatnight.Duringtheday,theyoftenfeelsleepy,havetroubleco
随机试题
引起失眠的病因常见有
30d婴儿,纯母乳喂养,1d来不哭、拒乳,抽搐2次来诊,查体:面色苍白,反应低下,前囟膨隆,心肺未见异常,四肢肌张力高。采血部位出血不止,血小板正常。此患儿最可能的诊断是9岁男孩,与家人怄气后被发现“抽搐”来诊。查体:神清,全身颤动,大汗。瞳孔缩小,双
A.脑膜炎B.蛛网膜下隙出血C.血管神经性头痛D.三叉神经痛E.脑出血下列患者最可能诊断为女,35岁,每遇月经来潮前头痛,伴失眠、心悸,体检无特殊。
下列所得属于劳务报酬所得的是()。
简述开发及利用美术课程资源的意义。
关于道德,准确的说法是:
德西效应说的是,在某些情况下,人们在外在报酬和内在报酬兼得的时候,不但不会增加工作动机,反而会减低工作动机,这个结果表明,进行一项愉快的活动(即内在报酬)时,如果提供外在报酬,反而会减少这项工作对参与者的吸引力。以下哪一项没有体现德西效应?()
从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性。
2019年1月23日,习近半总书记主持召开中央全面深化改革委员会第六次会议。会议指出,()是绿色发展的重要动力,是打好污染防治攻坚战、推进生态文明建设、促进高质量发展的重要支撑。
Toacomparativeeducationalistmanyquestionsabouttheselectionandtrainingofdoctorsandlawyersindifferentcountries
最新回复
(
0
)