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
80
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.
Biotechnology enables us ______.
选项
A、to change the DNA of human beings
B、to produce more milk by increasing the number of cows
C、to increase the functions of various cells and organisms
D、to find new human molecules
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/jM1O777K
0
考博英语
相关试题推荐
Mostpeoplewhotravellongdistancecomplainofjetlag.Jetlagmakesbusinesstravelerslessproductiveandmoreprone【21】makin
Mostpeoplewhotravellongdistancecomplainofjetlag.Jetlagmakesbusinesstravelerslessproductiveandmoreprone【21】makin
Wearewritingtothemanager______therepairsrecentlycarriedoutattheaboveaddress.
Inrecentyearstherehasbeena_____increaseinthecostofliving,manyfamilieshavetodependonthefederalaids.
Don’tcallhimjustacollegeprofessor.Internetentrepreneur,TVpersonality,advisortopresidents,andfriendtotherichan
Humanbeingsareanimals.Webreathe,eatanddigest,andreproducethesamelife【21】commontoallanimals.Inabiologicallabo
Scienceisadominantthemeinourculture.Sinceittouchesalmosteveryfacetofourlife,educatedPeopleneedatleastsome
FirstlaunchedinAprilthisyear,NetMySingaporealsoincludeseffortsthattraining,development,andtheexplorationofnew
PitythosewhoaspiretoputtheinitialsPhDaftertheirnames.After16yearsofcloselysupervisededucation,prospectivedoc
随机试题
甲、乙系夫妻,育有一子丙。甲的父亲去世后,甲的母亲李某与甲的弟弟丁一起生活。1990年起李某为照看丙,开始与甲一家共同生活。2010年甲因病去世,李某伤心过度而中风,乙一直照顾李某。2018年李某去世,留下存款6万元。该6万元
Fortunately,thedemonstration______tobequitepeaceful.
评价一个新的检测系统时,不需要进行实验评估的项目是
男孩5岁,右手背侧Ⅱ度烧伤,左手掌侧Ⅰ度烧伤,其烧伤面积为
甲氧氯普胺属于
下列属于定性的问题有哪几项?()
安检人员职业道德规范是评价安检人员()好坏的标准。
气体体积不变,温度从0℃上升到100℃时,气体绝对压强变为原来的()倍。
she[]
有如下运动队和运动会两个方面的实体:运动队方面运动队:队名、教练姓名、队员姓名队员:队名、队员姓名、性别、项名其中,一个运动队有多个队员,一个队员仅属于一个运动队,一个队一般有一个教练。运动会方面运动队:队编
最新回复
(
0
)