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
The study of genetics has given rise to a profitable new industry called biotechnology. As the name suggests, it blends biology
The study of genetics has given rise to a profitable new industry called biotechnology. As the name suggests, it blends biology
admin
2013-05-29
44
问题
The study of genetics has given rise to a profitable new industry called biotechnology. As the name suggests, it blends biology and modem technology through such techniques as genetic engineering. Some of the new biotech as they are called, specialize in agriculture and are working enthusiastically to patent seeds that give a high yield, that resist disease, drought, and frost, and that reduce the need for hazardous chemicals. If such goals could be achieved, it would be most beneficial. But some have raised concerns about genetically engineered crops.
"In nature, genetic diversity is created within certain limits," says the book Genetic Engineering, Food, and Our Environment. "A rose can be crossed with a different kind of rose, but a rose will never cross with a potato. Genetic engineering, on the other hand, usually involves taking genes from one species and inserting them into another in an attempt to transfer a desired property or character. This could mean, for example, selecting a gene which leads to the production of a chemical with antifreeze properties from an arctic fish, and joining it into a potato or strawberry to make it frost-resistant. It is now possible for plants to be engineered with genes taken from bacteria, viruses, insects, animals or even humans." In essence, then, biotechnology allows humans to break the genetic walls that separate species.
Like the green revolution, what some call the gene revolution contributes to the problem of genetic uniformity—some say even more so because geneticists can employ techniques such as cloning and tissue culture, processes that produce perfectly identical copies, or clones. Concerns about the erosion of biodiversity, therefore, remain. Genetically altered plants, however, raise new issues, such as the effects that they may have on us and the environment. "We are flying blindly into a new era of agricultural biotechnology with high hopes, few constraints, and little idea of the potential outcomes," said science writer Jeremy Rifkin.
Now biotech products are made______.
选项
A、within the limits of natural genetics
B、by violating laws of natural genetics
C、without the interference of humans
D、safer than those without the use of biotechnology
答案
A
解析
从第二段第四句可以看出,新的生物技术产品都有其局限性。
转载请注明原文地址:https://kaotiyun.com/show/DEHO777K
0
研究生英语学位课统考(GET)
相关试题推荐
Openupmostfashionmagazinesandyouwillseeincrediblythinmodelswithimpossiblehairandwearingunreasonablyexpensive,
AproposedRussianbanonEuropeanUnionmeatexportscouldjeopardizeRussia’saspirationstojointheWorldTradeorganization
Ifyoukeepgettingwrongnumbers,yourphonecouldbe______.
Whenaneight-lanesteel-truss-archbridgeacrosstheMississippiRiverinMinneapoliscollapsedduringtheeveningrushhouron
Personalityistoalargeextentinherent—A-typeparentsusuallybringaboutA-typeoffspring.Buttheenvironmentmustalsoh
ChlorineisamainstayinmostswimmingpoolsintheUnitedStates,andisusedtoeradicatebacteria.Abacteria-freepoolwill
ChlorineisamainstayinmostswimmingpoolsintheUnitedStates,andisusedtoeradicatebacteria.Abacteria-freepoolwill
AreportconsistentlybroughtbackbyvisitorstotheU.S.ishowfriendly,courteous,andhelpfulmostAmericansweretothem.
Thereareincreasinglyfraughtrelationshipsthatadultsarehavingwithchildren—inallwalksoflife,fromthepoliceandpoli
Huntingforajoblatelastyear,lawyerGantRedmonstumbledacrossCareerBuilder,ajobdatabaseontheInternet.Hesearched
随机试题
求曲线y=x2与直线y=0,x=1所围成的平面图形绕x轴旋转一周所得旋转体的体积.
A.活疫苗B.死疫苗C.类毒素D.外毒素E.病原体的部分成分百日咳疫苗是
细菌性痢疾:血吸虫病:
关于糖尿病神经病变以下说法正确的是
有关大隐静脉的描述,下列哪项是恰当的
对于城镇街坊内部隐蔽的界址点及村庄内部界址点,其点位允许误差为()cm。
【背景资料】 某水库枢纽工程总库容1500万m3,工程内容包括大坝、溢洪道、放水洞等,大坝为黏土心墙土石坝,最大坝高为35m,坝顶构造如图1-1所示。 施工过程中发生如下事件。 事件1:为加强工程质量管理、落实质量责任,依据《关于贯彻质量发展纲要
因审计范围受到限制,不能获取充分、适当的审计证据,虽影响重大,但不至于出具否定意见的审计报告时,可以出具无法表示意见的审计报告。( )
下列选项中,有关PowerPoint。演示文稿的表述,正确的一项是()。
Babies’ResponseForsometimeinthepastithasbeenwidelyacceptedthatbabies,andothercreatureslearntodothingsb
最新回复
(
0
)