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
2025-04-21
36
管理
问题
A new biotechnology procedure that could become commercially available in as little as two to four years is "transgenesis", 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 places 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 bean 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] In the first sentence, "to become commercially available" means ______.
选项
A、this procedure is available only on the market
B、this procedure can be used in producing better farm animals
C、This procedure can be used to promote business
D、People such as farmers can use this procedure in their production
答案
D
解析
转载请注明原文地址:http://tihaiku.com/zcyy/4047905.html
相关试题推荐
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Biotechnologyinoneformoranotherhasflourishedsinceprehistorictimes.
Biotechnologyinoneformoranotherhasflourishedsinceprehistorictimes.
Biotechnologyinoneformoranotherhasflourishedsinceprehistorictimes.
The______choiceforaconsumer,therefore,isthechoiceamongtheavailableone
Soil______isanaturalprocess.Itbecomesaproblemwhenhumanactivitycauses
Withitsstockpricerisingby20percent,thecompanybecomesthesecondmost__
Ifwecontinuetodestroythecountryside,moreanimalswillbecome______.A、dist
Inhisbookonbiotechnology,Rifkin_____that"fornow,themostimportantissue
随机试题
Inordertoapplyfortheposition,youneedto______aresumeandthreeletters
Itisreportedthatthemostadoptedchildrenwanttoknowtheirnaturalparents
She______seriouslyafterherstemstrucktherocksbutfortunatelynothingreal
Whiledrivingalongthetreacherouswornpath,______.A、myleftreartireblewo
套利者在进行套利交易的同时进行外汇抛补以防汇率风险的行为叫()。A.套期保值
交通标志按设置的时效分类,分为永久性标志和临时性标志。()
银行在银行结算账户的开立中,不得有下列行为()。A、违反规定为存款人多头开立银
A.水B.乙醇C.丙酮D.酸E.碱提取过程中常用于增加偏酸性有效成分溶解度和稳定
25℃时CaCO的溶解度在()最小。A.0.05mol·L^-1的AgN03溶
最新回复
(
0
)