首页
登录
职称英语
A new biotechnology procedure that could become commercially available in as
A new biotechnology procedure that could become commercially available in as
游客
2025-03-28
3
管理
问题
A new biotechnology procedure that could become commercially available in as little as two to four years is "transgenosis", which permits scientists to create an animal with specific traits by adding, removing, inactivating, or repairing genes in an embryo. The additional genes can come from any source. For example, if a gene of interest occurs in mosquitoes—say, one that codes for resistance to a certain disease—it can be removed and placed in the embryo of a farm animal, the several strains of commercially useful transgenic farm animals that will probably emerge in the next few years could include leaner pigs, poultry resisting to influenza or other deadly diseases, sheep with wool that is easier to wash, and goats that produce valuable pharmaceuticals in their milk.
The simplest way to make transgenic animals is to inject a gene into a one-cell embryo and then implant the embryo in another animal. Under the right conditions, the new gene joins one of the embryo’s strands of genes. Each cell created as the embryo divides gets a copy of the new gene. An alternative technique is to incorporate the gene into a type of virus known as a retrovirus that has been modified so it cannot reproduce itself after entering a cell. The virus, which cannot cause disease, delivers the gene to the cell’s nucleus. Often this method is better than gene injection because a retrovirus always delivers just one gene, and the gene is always undamaged and complete. [br] The tone of this passage is______.
选项
A、critical
B、factual
C、humorous
D、romantic
答案
B
解析
本文作者没有表示任何观点,只对转基因技术做简单介绍,因此“factual,实际的”是正确答案,其他三项“critical批判的;humorous幽默的;romantic浪漫的”都不正确。
转载请注明原文地址:https://tihaiku.com/zcyy/4016480.html
相关试题推荐
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetocc
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetocc
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetocc
Whowouldhavethoughtwewouldbecomeaplanetof"ologies"?There’sbiology
Ifyoubecomereconciledtoyourlot,youwillnevergetanewstartinlife.A、s
Kunzlookedsettobecomeastarinhisfield,buthegaveitallupafterthese
Whendid"TheOprahWinfreyShow"becomenationallypopular?[br][originaltext
Whendid"TheOprahWinfreyShow"becomenationallypopular?[br][originaltext
随机试题
[originaltext]W:Withusnow,isMalcolmBricklin,CEOofVisionaryVehicles.M
Acollegelibraryisaninexhaustibleandeverchangingstorehouseofinform
[originaltext]Moderator:Goodmorning,class.TodayProfessorLiuwillgiveus
图a)所示电路中,复位信号、数据输入及时时钟脉冲信号如图b)所示,经分析可知,在
根据建设项目的( ),政府规定建设单位取得建设用地的方式分为两种:一是无偿划拨
医院药事管理委员会的组成是A:主管院长和药剂科主任 B:主管院长、药剂科及有关
某超市在春节前购进一批食品礼盒,加价后全部卖出,用收入的一半又购进一批,加价后全
简述现代企业人力资源管理各个历史发展阶段的特点。
下列说法中,正确的是( )。A.大赦既赦其刑,又赦其罪B.特赦只赦其刑
(2018年真题)根据《安全生产法》,关于生产安全事故应急救援与调查处理的说法,
最新回复
(
0
)