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
外语
There have been several claims to have cloned humans over the past few years. Most have been bogus. But the announcement made th
There have been several claims to have cloned humans over the past few years. Most have been bogus. But the announcement made th
admin
2015-09-30
27
问题
There have been several claims to have cloned humans over the past few years. Most have been bogus. But the announcement made this week by Woo Sur Hwang, of Seoul National University in South Korea, and his colleagues, is serious. It is the first to achieve the accolade of publication in a peer-reviewed scientific journal. Dr. Hwang’s work appears in Science.
The terminology of human development has become slippery over the past few years, in the hands of both "life-begins-at-conception" propagandists who want to stop this sort of research, and publicity-seeking scientists who have claimed more than they have really achieved. What Dr. Hwang and his team have created is not what developmental biologists would normally refer to as an embryo. But it is a genuine scientific advance. South Korea’s researchers have taken egg cells from volunteer women, removed the nuclei from those cells (which contain only half of the genetic complement required to make a human being, since the other half is provided by the sperm), and replaced each nucleus with one taken from one of the volunteer’s body cells (which contains a full genetic complement). Given a suitable chemical kick-start, such re-nucleated cells will begin dividing as though they were eggs that had been fertilised in the more traditional manner. Since they have all of the mother’s genes, they count as clones.
Then the team cultured the dividing eggs until they had formed structures called blastocysts, with a few dozen cells each. This is the significant advance. At this stage the structure, though still just a featureless ball of cells, has started to differentiate into the body’s three basic cell types (known as endoderm, mesoderm and ectoderm). The researchers were able to extract cells from some of their blastocysts, and grow tissues containing all three cell types.
These are so-called stem cells, which can be directed to form a wide variety of the specialised cells from which organs are built. That, not the creation of new human beings, is the stated reason for this sort of research, since specialised cells made this way might be used to replace the cells lost in diseases such as Parkinson’s and type-I diabetes. This process is known as therapeutic cloning.
No doubt Dr Hwang’s scientific success will sharpen the debate between those who see therapeutic cloning as a potential force for good, and those who see it as a step on the road to a cloned human being. The former have been queuing up to praise the scientist’s work. It is "a major medical milestone" that could help spur a "revolution", said Robert Lanza, a cloning expert.
But opponents of therapeutic cloning should not worry too much yet. The road from a blastocyst to a baby is a long and complex one. Nevertheless, the South Korean breakthrough make’s it more urgent than ever that legislation be passed differentiating clearly between therapeutic and reproductive cloning—permitting the former and prohibiting the latter.
What does the word "bogus" (Line 2) most probably mean?
选项
A、Different.
B、Fake.
C、Bold.
D、Genuine.
答案
B
解析
词汇题。此题需要对上下文进行分析。作者认为以前大多数关于克隆出人的宣布都是bogus,紧接着用But转折指出韩国宣布的结果却是serious(严肃认真的)。第二段也提到,But it is a genuine scientific advance。由此可推断,bogus与serious,genuine意思相反。四个选项中只有B项Fake“假的;伪造的”合理,所以为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/saWO777K
0
在职攻硕英语联考
相关试题推荐
A、Adoorkeeper.B、Ahousingagent.C、Acarrepairman.D、Abusdriver.B女士说:打扰了。我想在这个小区里租两居室的公寓房。男士说:有家具的还是无家具的?女士说:有家具的,最好比较安静。男
Thereisnodoubtthatairpollutionisaglobalcrisis:itcausesanannualdeath【C1】______of6.5million.Thatisdoublethet
Someoftherecentactionsofthegovernmentarenotinlinewiththeirstatementofpolicy.
Asamother,Iunderstandthepowerfulbondbetweenaparentandchild.Ilovemyson,andIreallywoulddoanythingforhim.S
MysupervisorpermitsmetotakeafewdaysoffprovidedthatIcanfinishthisexperiment.
"Couchpotatoes"inParagraph1referstothosewho______.Intermsofleisuretimeactivities,peopleintheUnitedStates__
Accordingtothepassage,thechiefpurposeofexplorersingoingtounknownplacesinthepastwas______.Whatisthemaingoa
Thearticleopensandcloseswithdescriptionsoftwonewsreports,each______onemajorpointincontrastwiththeother.
Ausefuldefinitionofanairpollutantisacompoundaddeddirectlyorindirectlybyhumanstotheatmosphereinsuchquantitie
AchainofshopsinEastYorkshire,Englandhasbeentoldthatitwouldbeacriminaloffencetosellthousandsoftubesoftoot
随机试题
下列属于我国公务员的义务的有()
患者,男性,30岁,舌两侧缘均可见灰白色斑块,表面呈毛茸状,不能被擦去,CD4+T淋巴细胞计数<200/mm3。应考虑
甲公司未取得商铺预售许可证,便与李某签订了《商铺认购书》,约定李某支付认购金即可取得商铺优先认购权,商铺正式认购时甲公司应优先通知李某选购。双方还约定了认购面积和房价,但对楼号、房型未作约定。李某依约支付了认购金。甲公司取得预售许可后,未通知李某前来认购,
《治安管理处罚法》规定了扣押登记。下列有关扣押登记的说法正确的是:()
指定分包是业主将分包人指定给承包人。()
关于水泥混凝土路面施工的说法错误的是()。
在商业银行支付结算业务中,托收属于()。
设f(x)在(一∞,+∞)连续,以T为周期,令F(x)=∫0xf(t)dt,求证:(Ⅰ)F(x)一定能表成:F(x)=kx+φ(x),其中k为某常数,φ(x)是以T为周期的周期函数;(Ⅱ)∫0Tf(x)dx;(Ⅲ)若又有f(x
OnSeptember7,2001,a68-year-oldwomaninStrasbourg,France,hadhergallbladder(胆囊)removedbysurgeons’operating,viac
Nearlyallsurgicalstuntsstickthemselveswithneedlesand【C1】______instrumentswhileintraining.But【C2】______failtorepo
最新回复
(
0
)