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
91
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.
In nature, genetic diversity is created______.
选项
A、by mixing different species
B、within the species itself
C、through natural selection
D、through selection or contest
答案
A
解析
从第二段最后一句可以看出,基因多样性是不同基因物种的混合体。
转载请注明原文地址:https://kaotiyun.com/show/JEHO777K
0
研究生英语学位课统考(GET)
相关试题推荐
Squadmembers,alreadydeckedoutin______chemicalsuits,putonmasksandrubbergloves.
HumanCloningTheapplicationsofcloningasweenvisionarenotnightmarishandinhumane,butwillimprovetheoverallqual
Inasocietywhereallaspectsofourlivesaredictatedbyscientificadvancesintechnology,scienceistheessenceofourexi
Thethieves______thewastepaperallovertheroomwhiletheyweresearchingforthediamondring.
Averyimportantworldproblemistheincreasingnumberofpeoplewhoactuallyinhabitthisplanet.Thelimitedamountoflanda
AproposedRussianbanonEuropeanUnionmeatexportscouldjeopardizeRussia’saspirationstojointheWorldTradeorganization
Itisallverywelltoblametrafficjams,thecostofpetrolandthequickpaceofmodernlife,butmannersontheroadsarebe
AstoutoldladywaswalkingwithherbasketdownthemiddleofastreetinPetrogradtothegreatconfusionofthetrafficand
TheUnitedNationsPopulationFundhaspickedOctober31asthedaytheworldwillbehometo7billionpeople.Forbettera
Today,thecomputerhastakenupappliancestatusinmorethan42percentofhouseholdsacrosstheUnitedStates.Andthesecomp
随机试题
下列关于哮病的各项叙述中,错误的是()
我国的股票价格指数有()。
横向共同配送可以分为()。
槟榔肝是指()。
针灸:拔罐:中医
20世纪初普朗克、波尔等物理学家共同创造了量子力学,它与相对论一起被认为是现代物理学的两大基本支柱。量子力学的发展,革命性地改变了人们对物质的结构及其相互作用的认识。借助量子力学,许多现象才得以真正地被解释,新的、无法凭直觉想象出来的现象被预言,接着又被验
《夏小正》
在4~20岁之间,脑电发展存在明显的加速时期,包括
Theglobalclimateeffortofloweringdownthetemperaturescanrefrainthedevelopmentofoil.
______yourtimelyadvice,Iwouldneverhaveknownhowtogoaboutthework.(1994年考试真题)
最新回复
(
0
)