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
Scientists have for the first time used cloning to create human embryos that live long enough in a laboratory dish to have their
Scientists have for the first time used cloning to create human embryos that live long enough in a laboratory dish to have their
admin
2009-04-26
66
问题
Scientists have for the first time used cloning to create human embryos that live long enough in a laboratory dish to have their stem cells harvested. The feat could set the stage for physicians to produce cells and tissues, tailored to a patient’s genetic identity that can treat a wide variety of human illnesses. The accomplishment also provides a road map for how to clone a person, an even more divisive undertaking.
The new work, performed in South Korea, represents "a major advance in stem cell research. It could help spur a medical revolution as important as antibiotics and vaccines", says Robert Lanza of Advanced Cell Technology (ACT), a company in Worcester, Mass., that’s also investigating the promising stem cell strategy called therapeutic cloning.
"However, now that the methodology is publicly available", Lanza adds, "I think it is absolutely imperative that we pass laws worldwide to prevent the technology from being abused for reproductive-cloning purposes".
While some fertility doctors and a religious cult have claimed success at creating a pregnancy via cloning, they’ve offered no convincing proof. In contrast, the South Korean research is being reported at the meeting of the American Association for the Advancement of Science in Seattle and will appear in an upcoming Science. "This is reality", says stem cell researcher John Gearhart of Johns Hopkins University. "Here is a bona fide, refereed journal saying that a human embryo has been cloned and a cell line derived from it".
Although ACT has not yet published a report of a cloned human blastocyst, Lanza says that the South Korean success is "consistent with our own results". Therapeutic cloning appeals to Lanza and physicians because cells made this way could have the same DNA as a patient’s cells do and thus avoid rejection after they’re transplanted.
Seeking a compromise that would permit this strategy to be pursued, many scientists have called for legislation that would ban cloning to produce a baby but allow the creation of cloned embryos to generate stem cells for research or therapies. "The debate has been very polarized", notes bio-ethicist Laurie Zoloth of Northwestern University in Evanston.
选项
A、human embryos are very short-lived outside a human body.
B、human embryos are extremely hard to be cloned.
C、human genetic identity is difficult to be defined.
D、human cloning is strongly opposed by some researchers.
答案
A
解析
细节题。文章第一句说"科学家们第一次使用克隆技术创造出在实验室里存活足够久的人类胚胎,以便能够取得这些胚胎的干细胞"。证明干细胞必须在胚胎存活足够久时才能获得,而胚胎是第一次在实验室存活了这么久,说明干细胞难于获得的原因是人类胚胎在人体外存活时间太短。
转载请注明原文地址:https://kaotiyun.com/show/5pi4777K
0
考研英语一
相关试题推荐
Themainideaofthefirstparagraphisthat______.Whatdoestheword"disruptive"(Paragraph3)mostprobablymean?
Thesentence"Aftereachrainshower,anotherInternetmillionairesprangup"(Paragraph1)means______.Whatisspecialabout
Excitement,fatigue,andanxietycanallbedetectedfromsomeone’sblinks,accordingtopsychologistJohnStern(21)Washington
Excitement,fatigue,andanxietycanallbedetectedfromsomeone’sblinks,accordingtopsychologistJohnStern(21)Washington
Thelongestbullruninacenturyofart-markethistoryendedonadramaticnotewithasaleof56worksbyDamienHirst,Beauti
Asia’srealboat-rockerisagrowingChina,notJapan,aseniorAmericaneconomistobserved.Thereissomuchnoisesurround
ArecentcaseinAustraliashowshoweasilyfearcanfrustrateaninformant’sgoodintentions.InDecember,awomanwroteanonym
[A]BeMends[B]Bemoreaffectionate[C]Stoparguingovermoney[D]Makeyourpartnerapriority[E]Respecteach
Itwillbemadeinasimilarwaytobrewingbeer.Wearenottalkingaboutanewkindofdrink,however,butdescribinganewin
Likeatiredmarriage,therelationshipbetweenlibrariesandpublishershaslongbeenreassuringlydull.E-books,however,are
随机试题
法治原则包括:_________的设置及其体制要有法律上的根据和保障,机构的设置与变更要依照法定的程序进行。
费用可能表现为企业负债的减少。()
A.眶上神经B.泪腺神经C.睫状神经节的长根D.筛前神经E.睫状神经节短根额神经分出的是
前列腺增生最主要的症状是
下列选项中,不属于切断传染病传播途径的是
A.督脉B.任脉C.冲脉D.带脉E.阳维脉
胆汁酸合成的限速酶是()
某工业企业为增值税一般纳税企业,适用的增值税税率为17%,材料按计划成本计价核算。甲材料计划单位成本为每公斤10元。该企业2008年4月份有关资料如下:(1)“原材料”账户月初余额40000元,“材料成本差异”账户月初贷方余额500元,“材料采购
遵守行文规则是为了()。
旅行社组织出境旅游(含一日游),为旅游者办理的旅游意外保险金额说法错误的是()。
最新回复
(
0
)