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
2015-05-24
108
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 presenceof 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/bN74777K
0
考研英语一
相关试题推荐
TheRepublicanpresidentialcandidateRickSantorumrecentlysetoffadebatewhenheattackedAmerica’scollegesas"indoctrinat
Ofallthecutstopublicservices,fewhaveprovokedsuchloudprotestsasproposalstocloselibraries.Petitionsandcursesh
EveryonecomplainsthatcorporateAmericais【C1】______tohireadditionalworkers.Far【C2】______attentionhasbeenpaidtothefl
NewToolstoResearchEarthquakeOnDecember16th,1811,theresidentsofNewMadrid,Missouri,werestartledoutoftheirb
Ifthereisanyendeavourwhosefruitsshouldbefreelyavailable,thatendeavourissurelypubliclyfinancedscience.Morally,
Ifthereisanyendeavourwhosefruitsshouldbefreelyavailable,thatendeavourissurelypubliclyfinancedscience.Morally,
YouarepreparingtointroduceyourstudenttoProfessorTerence.Writealetterofrecommendation,elaboratingonthereasonsw
Scienceisanenterpriseconcernedwithgaininginformationaboutcausality,ortherelationshipbetweencauseandeffect.Asim
Thesituationof"pay-per-click"advertisingcanbedescribedas______.ThePPAwillbecomemorepopulardueto______.
Thedyingsoldierhadthemessage______straighttotheheadquarters.
随机试题
Theyalwayskeepongood______withtheirnext-doorneighborsforthechildren’ssake.
()
下列哪种光源的色温为暖色?[2004年第26题]
企业接受债务人以非现金资产抵偿债务方式取得的固定资产,其入账价值的内容包括( )。
在财务分析中,将通过对比两期或连续数期财务报告中相同指标进行对比,确定其增减变动的方向、数额和幅度,来说明企业财务状况或经营成果的变动趋势的方法称为比率分析法。()
客户A公司正在研发一项产品。在研发过程中,A公司发现该产品存在侵犯B公司的实用新型专利的风险,为此,A公司进行了检索并得到对比文件1、2,拟对B公司的实用新型专利(下称涉案专利)提出无效宣告请求,在此基础上,A公司向你所在代理机构提供了涉案专利(附件1)、
简述中学历史教学评价的作用。
【2018下】简述弗洛伊德的人格发展阶段理论。
我甚至很少有闲散的时光了,它们都被微信上的即兴交流吞噬得干干净净,何止是闲散时光,我原来的阅读、思考时间都开始被__________。至于写作,因为不断地迅速释放,我似乎再难找到那种__________之后的充沛表达。填入画横线部分最恰当的一项是
数据库系统运行维护工作的主要目的是保证数据库系统稳定运行。下列工作中属于数据库运行维护工作的是()。
最新回复
(
0
)