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 genetic characteristics of all life forms on earth are embodied in the chemical structure of DNA molecules. An organism’s DN
The genetic characteristics of all life forms on earth are embodied in the chemical structure of DNA molecules. An organism’s DN
admin
2010-07-14
22
问题
The genetic characteristics of all life forms on earth are embodied in the chemical structure of DNA molecules. An organism’s DNA molecules provide a complete blueprint for its physical makeup. Genetic engineering is the process of altering the DNA genetic code to change the characteristics of plants and animals. Through the process, scientists can literally build to order new life forms that perform desired functions. For hundreds of years, humans have engineered the development of food crops and domesticated animals through selective breeding practices. For example, the modern dairy cow is the result of centuries of carefully breeding individual animals that carried the genetic trait for high milk production. However, new technology makes it possible for scientists to restructure the DNA molecules themselves and thus obtain more rapid and more radical genetic changes than were possible in the past. This new process is commonly called recombinant DNA technology or gene splicing because it involves disassembling the DNA molecule and then recombining or splicing the pieces according to a new pattern. The gene-spliced DNA molecule may have a genetic code that has never existed before.
Although recombinant DNA technology is still in its infancy, it has al ready demonstrated its value. New crop breeds produced by this process are already growing in farmers’ fields. Crops that are genetically engineered to resist pests, diseases, and drought could be important in efforts to alleviate starvation around the world. Scientists are trying to use genetic engineering to produce important drugs such as insulin (胰岛素) and interferon (干扰素) cheaply. They are also working on a genetically engineered generation of wonder drugs to combat cancer and other killer diseases. However, the recombinant DNA technology brings with it problems our society has not previously faced. Gene splicing could produce new disease microorganisms, deadly to us or to the plants and animals upon which we depend. The possibility of altering human genetic structure raises serious moral, political, and social is sues. Genetic engineering illustrates dramatically the promises and dangers of technological development. The decisions our society makes about genetic engineering will undoubtedly have tremendous consequences in the years to come.
The best title for this passage is ______.
选项
A、The Basic Function of Genetic Engineering
B、New Applications of Genetic Engineering
C、Recombinant DNA Technology: A New Process in Genetic Engineering
D、The Promises & Dangers of Technological Development
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/sh7K777K
0
大学英语六级
相关试题推荐
Googleisaworld-famouscompany,withitsheadquartersinMountainView,California.ItwassetupinaSiliconValleygaragei
Forcenturiesthegypsieshavelivedasaunfetteredpeoplewhotraveled【S1】______throughhalfthecountriesofthew
A、Adelicateart.B、Areligion.C、Anexactscience.D、Awayoflife.B原文中说“Yogaisnotareligion”,所以瑜珈不能归为宗教。
Theaboveexperimentshowsthatnotalltheinformationwhichisreceivedcanberetainedforevenasecond.Theinformati
A、Atafair.B、Atacafeteria.C、Inacomputerlab.D、Inashoppingmall.A本题为细节判断题,只要听清了女士的问句:Isthisthefirstyearyou’vebee
AIDSThediseaseAIDShasbecometheleadingcauseofdeathamongyoungadultsinAmerica.MuchrecentAmericanculturedeal
______(战争断断续续打了许多年),buteveryoneinthefamilywassafe.
A、PeopleintheUnitedStates.B、ThecharacteristicsofAmericanEnglish.C、ForeignersintheUnitedStates.D、TheteachingofE
A、Thewomanblamesthemanforhisabsence.B、Thewomanthinksthateverythingwasallright.C、Thewomanthanksthemanforhis
A、Peopleinthedarkbrownroomwalkedmorequickly.B、Peoplespentmoretimeinthewhiteroomthaninthedarkroom.C、Darkbr
随机试题
在热压灭菌中,温度为115℃,压力为67kPa时,其所需灭菌时间正确的是
试带法对哪种糖类检测特异性强
A.益智B.醒头草C.国老D.冰台E.忍冬花金银花的别名是()。
关于早搏的细述,下列哪项是正确的?()
可用于几乎所有金属和合金的焊接,特别适用于焊接有色金属、不锈钢和耐热钢,其焊接板材厚度在3mm以下为宜,此种焊接方法为( )。
根据我国现行规定,不同类别的建设工程项目应采用不同的组织实施方式,下列组合中正确的是()。
债务人以明显不合理低价转让财产,对债权人造成损害的,债权人可以请求人民法院撤销债务人的行为。()
完形—顿悟说认为完形是一种______结构,是对事物关系的认知。
人一般都偏好醒目的颜色。在婴幼儿眼里,红、黄都是醒目的颜色,这与成人相同;但与许多成人不同的是,黑、蓝和白色是不醒目的。市场上红、黄色为主的儿童玩具,比同样价格的黑、蓝和白色为主的玩具销量要大。以上信息最能支持以下哪项结论?
应用题必须用蓝、黑色钢笔或者圆珠笔写在答题纸的相应位置上,否则无效。请根据下图所示网络结构回答下列问题。设备1应选用哪种网络设备?
最新回复
(
0
)