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
Stanford University’s Irving Weissman has said that he would like to inject human stem cells into the developing brains of fetal
Stanford University’s Irving Weissman has said that he would like to inject human stem cells into the developing brains of fetal
admin
2016-10-15
88
问题
Stanford University’s Irving Weissman has said that he would like to inject human stem cells into the developing brains of fetal mice, with the goal of producing mouse brains composed chiefly of human brain cells. Such mice might be useful for testing drugs to cure or prevent various human brain diseases. Since the brains would have the architecture of mouse brains, it is unlikely that they would become biotech Stuart Littles and exhibit any characteristics that would cause us moral concerns.
But what about injecting human brain stem cells into the developing brains of fetal chimpanzees? That’s clearly a bit closer to the line, but if human cells are simply integrated into the typical architecture of a chimpanzee’s brain, then again, it would probably create no new ethical problems.
Beside the possibility of giving human characteristics to animals, injecting human stem cells into non-humans could create other moral concerns. For example, stem cells might transdifferentiate into gamete-producing cells, and integrate themselves into the ovaries and testes of mice, where they would produce completely human eggs and sperm. One could imagine such chimeric male and female mice mating and producing a completely human embryo. Of course, that embryo would be unable to develop in the uterus of a mouse, so the world would not have to deal with the birth of a child whose mom was a rodent. But again, what if this research were done with larger chimeric animals—say, cows—that could possibly carry a human baby to term?
But chimeric mice could also be used to help people overcome infertility. Bone marrow stem cells from an infertile woman or man might be injected into a fetal mouse, where they could be transdifferentiated into gamete-producing cells. Gametes might be harvested from the mice and used in IVF procedures to engender a child. Assuming it’s medically safe, producing a child in this way would not be unethical.
Finally, it has to be asked: would eating a liver composed chiefly of human liver cells grown in a sheep be cannibalism? I say yes; don’t do it. Save them for transplants.
As humanity’s biotechnological prowess increases, we will confront again and again the question of what, if any, limits should be placed on research that mixes human and animal genes, cells and tissues. The main ethical concern about such research is not the creation of improved and useful animals, but the risk of producing what would be, in effect, diminished human beings.
Producing mouse brains composed chiefly of human brain cells would______.
选项
A、facilitate the development of biotech
B、have little to do with ethical problems
C、initiate new procedures for testing drugs
D、fail to exhibit any human characteristics
答案
B
解析
根据第一段最后一句“…it is unlikely that they…would cause us moral concerns”,B应为答案。
转载请注明原文地址:https://kaotiyun.com/show/t1oZ777K
0
考研英语一
相关试题推荐
FromthefoundingofHarvardCollegein1636untiltheCivilWar,Americanuniversityeducationwasmostlyaboutsendingpiousa
Familiarasitmayseem,gravityremainsamysterytomodernphysics.Despiteseveraldecadesoftrying,scientistshavefailed
Birth,growth,decline,death:itistheusualcycleforpeople,companiesandindustries.Butthestoryofviolin-makinginCre
Aslongaspeoplehavelookedupatthenightsky,theyhavewonderedwhetherhumanityisaloneintheuniverse.ofplacesclose
Humanity’sgreatestaccomplishmentofthepastfivedecades,declaredBillGatesthisweek,isthereductioninthenumberofde
Harvardthrilledmiddle-classparentslastweekbycappingitstuitionforfamilieswithincomesofupto$180,000at10percent
Thetranslatormusthaveanexcellent,up-to-dateknowledgeofhissourcelanguages,full【C1】______inthehandlingofhistarget
Cultureinfluencesanindividual’shealthbeliefs,behaviours,activitiesandmedicaltreatmentoutcomes.【C1】______thesignifica
Somepeoplearefriendlydrunks,whereasothersarehostile,potentiallyposingadangertothemselvesandothers.Thedifferenc
Forthepastfiveyears,Dr.StephenPosthasbeenfundingresearchprojectsthattesthowaltruism(selflessness),compassion,a
随机试题
圣吉把学习型组织的五项技能称为“五项修炼”,其核心是()
患者,男,16岁,5个月前无明显诱因于面部、上胸背部出现丘疹、脓疱、结节、囊肿,有触痛,时轻时重,逐渐增多,部分皮疹有破溃、结痂,形成散在瘢痕。发病以来一般情况可,睡眠、饮食及大小便无特殊。既往无药物过敏史、无服用糖皮质激素等药物史,也无焦油、沥青、卤代氢
根据《药品经营质量管理现范》的规定,怕压药品应
甲公司与乙公司就一批高档西服的买卖合同以电子邮件的形式进行磋商。5月8日,甲公司首先提出该批西服的数量、质量、价格等内容,询问乙公司能否提供。乙公司接受了甲公司的要求,并就履行地点、期限等内容提出了若干补充意见,且提出采用合同书形式订立合同,并于5月10日
四部门经济中的部门包括()。
2014年1月1日,甲公司采用分期收款方式向乙公司销售一套大型设备,合同约定的销售价格为1000万元(不含增值税),分5次于每年12月31日等额收取。该大型设备成本为800万元。假定该销售商品符合收入确认条件,同期银行贷款年利率为6%。不考虑其他因素,假定
胆汁是由()分泌的。
方舟中学有一台电脑能上QQ,但无法浏览网页,在下列选项中可能设置错误的是()。
河姆渡和半坡居民过着定居生活,最主要的原因是()。
第三产业
最新回复
(
0
)