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
37
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
ThreedaysagoyousentyourIDcardtoyourparentsthroughS.F.Express,withthepromiseofnext-daydelivery.However,the
Themade-for-TVmovieaboutatornadocarryingman-eatingsharkswasasurprisehitinAmerica.ThepreposterousplotofSharkna
Themade-for-TVmovieaboutatornadocarryingman-eatingsharkswasasurprisehitinAmerica.ThepreposterousplotofSharkna
Eventoday,youmightthinkmanyAmericanchildrenareindangerofbecomingseriouslyundernourished.Millionsofparentsnever
Thereweresomeconsistentpatternsamongtheheavierreaders:Fortheyoungerchildren—ages6to11—beingreadaloudtoregula
LastweekIhadlunchwithamanwhousedtobeoneofthemostseniorbankersintheUK.Thetroublewithbusinesstoday,heco
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
WhilewesterngovernmentsworryoverthethreatofEbola,amorepervasivebutfarlessharmful【C1】______isspreadingthroughth
随机试题
宋代总理全国军务的最高机关是()
Ithinkthesetraditionalcustomsshouldbe______.
关于风险识别结果不正确的是()。
企业根据消费者所处城镇的大小来细分市场的标准是()
婴儿笑的发展可分为以下阶段()。
下列说法不正确的是()。
根据以下资料,回答下列问题。国家统计局公布的《2011年城乡居民收入增长情况》称,通过对全国31个省(自治区、直辖市)7.4万户农村居民家庭和6.6万户城镇居民家庭进行抽样调查,2011年全国农村居民人均纯收入6977元,比上年增加1058元,剔
中国人民正在为实现中华民族伟大复兴的中国梦而奋斗。实现中国梦,是物质文明和精神文明均衡发展、相互促进的结果,没有文明的继承和发展,没有文化的弘扬和繁荣,就没有中国梦的实现。实现中国梦,是物质文明和精神文明比翼双飞的发展过程。随着中国经济社会不断发展,中华文
假定学生关系是S(S#,SNAME,SEX,AGE),课程关系是C(C#,CNAME,TEACHER),学生选课关系是SC(S#,C#,GRADE),要查找选修"COMPUTER"课程的女学生的姓名,将涉及到关系
Infuturetradethekeydevelopmenttowatchistherelationshipbetweentheindustrializedandthedevelopingnations.TheThir
最新回复
(
0
)