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
20
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.
What is the author’s attitude towards maternal interference?
选项
A、Supportive.
B、Biased.
C、Impartial.
D、Ironic.
答案
C
解析
观点态度题。通读全文可知作者并未对母性干预做出任何主观性的评论。而文章最后一句“无论人们注意到与否,母亲们的保护性干预始终存在”也印证了这点,因此C项“中立的”正确。
转载请注明原文地址:https://kaotiyun.com/show/NmbZ777K
0
考研英语一
相关试题推荐
Bankershavebeenblamingthemselvesfortheirtroublesinpublic.Behindthescenes,theyhavebeentakingaimatsomeoneelse;
Bankershavebeenblamingthemselvesfortheirtroublesinpublic.Behindthescenes,theyhavebeentakingaimatsomeoneelse;
Bankershavebeenblamingthemselvesfortheirtroublesinpublic.Behindthescenes,theyhavebeentakingaimatsomeoneelse;
Thereweresomeconsistentpatternsamongtheheavierreaders:Fortheyoungerchildren—ages6to11—beingreadaloudtoregula
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
TherewasagreatdealtobetroubledbyinareportbytheInternationalCommitteeoftheRedCrossdocumentingthekindsofto
Insomniacs(someonewhocannotsleepeasily)don’tjustsufferatnight.Duringtheday,theyoftenfeelsleepy,havetroubleco
随机试题
Hehasastrong______ofduty.
抗菌药物的不合理应用表现在诸多方面()。
缺铁性贫血的原因白血病贫血的原因
下列关于胆囊的描述,错误的是
心悸不安,阵发心痛、胸闷不舒,唇甲青紫,舌质暗紫或瘀斑,脉结代或涩。证治应选
某县审计局4月20日开会决定对该县国有企业A进行审计,22日该审计局的一名审计人员先期到达A企业进行审计,审计过程中发现A企业与该县另一企业B之间的一笔购销木材合同存在疑点,遂决定到B企业进行调查。4月29日,该审计局的两名审计人员来到B企业,并向B企业的
为减少漏风量对排烟效果的影响,要求每个排烟系统设排烟口的数量不宜超过()个。
资产负债表上银行总资产减去总负债后的剩余部分即为()。
下列图形中,符合所给图形的变化规律的是:
Lightinglevelsarecarefullycontrolledtofallwithinanacceptablelevelforoptimalreadingconvenience.
最新回复
(
0
)