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
Biotechnology in one form or another has flourished since prehistoric times. When the first human beings realized that they coul
Biotechnology in one form or another has flourished since prehistoric times. When the first human beings realized that they coul
admin
2013-01-29
42
问题
Biotechnology in one form or another has flourished since prehistoric times. When the first human beings realized that they could plant their own crops and breed their own animals, they learned to use biotechnology. The discovery that fruit juices fermented into wine, or that milk could be converted into cheese or yogurt, or that beer could be made by fermenting solutions of malt and hops began the study of biotechnology. When the first bakers found that they could make a soft, spongy bread rather than a firm, thin cracker, they were acting as fledgling biotechnologists. The first animal breeders, realizing that different physical traits could be either magnified or lost by mating appropriate pairs of animals, engaged in the manipulations of biotechnology.
What then is biotechnology? The term brings to mind different things. Some think of developing new types of animals. Others dream of almost unlimited sources of human therapeutic drugs. Still others envision the possibility of growing crops that are more nutritious and naturally pest-resistant to feed a rapidly growing world population. This question elicits almost as many first-thought responses as there are people to whom the question can be posed. In its purest form, the term "biotechnology" refers to the use of living organisms or their products to modify human health and the human environment. Prehistoric biotechnologists did this as they used yeast cells to raise bread dough and to ferment alcoholic beverages, and bacterial cells to make cheeses and yogurts and as they bred their strong, productive animals to make even stronger and more productive offspring. Throughout human history, we have learned a great deal about the different organisms that our ancestors used so effectively. The marked increase in our understanding of these organisms and their cell products gains us the ability to control the many functions of various cells and organisms. Using the techniques of gene splicing and recombinant DNA technology, we can now actually combine the genetic elements of two or more living cells. Functioning lengths of DNA can be taken from one organism and placed into the cells of another organism. As a result, for example, we can cause bacterial cells to produce human molecules; cows can produce more milk for the same amount of feed, and we can synthesize therapeutic molecules that have never before existed.
Which of the following statements is TRUE?
选项
A、We can’t use different organisms as effectively as our ancestors did.
B、Biotechnology has done harm to the human being since prehistoric times.
C、Biotechnology can be used to modify human health and human environment.
D、Human therapeutic drugs are only dreams of human beings.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/kM1O777K
0
考博英语
相关试题推荐
Thisprogramwilltakekidswhohaveamanifesthistoryofviolentacts.
Mostpeoplewhotravellongdistancecomplainofjetlag.Jetlagmakesbusinesstravelerslessproductiveandmoreprone【21】makin
Mostpeoplewhotravellongdistancecomplainofjetlag.Jetlagmakesbusinesstravelerslessproductiveandmoreprone【21】makin
Researcherswhorefusetosharedatawithothersmay【51】otherstowithholdresultsfromthem,【52】astudybyhealth-policyanalys
"Popularan"hasanumberofmeanings,impossibletodefinewithanyprecision,whichrangefromfolkloretojunk.Thepolesare
(1)Sincethelineageofinvestigativejournalismismostdirectlytraceabletotheprogressiveeraoftheearly1900’s,itisn
Itisnottoolate,but______actionisneeded.
What,then,doesDruckersuggestarethenewknowledge-basedindustriesonwhicheconomicgrowthwilldepend?Hediscussesthree
EnergyuseandairpollutionhavebeensynonymousinChinafordecades,especiallyinurbanareas.【66】Fifteenor20yearsagoin
随机试题
什么是现时成本财务报表?应如何编制?
把科学发展观确立为党的指导思想是在党的()。
Therewas______time______Ihatedtogotoschool.
女,26岁,头晕,乏力8个月。体查:巩膜黄染,睑结膜苍白,淋巴结无肿大,脾左肋下1cm,肝未触及。Hb58g/L,MCV80fl,MCHC27%,Tbil66.69μmol/L(3.9mg/dl),Ibil58.14μmol/L(3.4mg/dl
A.敏感抗生素分组轮流使用B.用药后症状消失即停药C.用药72小时无效应换药,疗程2周D.用糖皮质激素E.应用吲哚美辛急性肾盂肾炎的治疗应是
关于中药糖浆剂叙述中不正确的是
【2011改编】1.某建设项目的工程费由以下内容构成:(1)主要生产项目1500万元:建筑工程费300万元,设备购置费1050万元,安装工程费150万元。(2)辅助生产项目300万元:建筑工程费150万元,设备购置费110万元,安装工程费40万元。(
根据2001年12月修订后的《贷款风险分类指导原则》,借款人无法足额偿还本息,即使执行抵押或担保,也肯定要造成较大损失,这是()贷款。
下列叙述中正确的是()。
A、4,800kilometers.B、45kilometers.C、40kilometers.D、5,800kilometers.A新闻中出现了多组数字,对应的事物有所不同。B、C项中的数字都出现过,但是前者指的是减掉的重量,单位是公斤;
最新回复
(
0
)