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
2025-04-16
32
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 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] Which of the following is NOT true?
选项
A、After injection, the embryo gets a copy of the new gene as it divides.
B、The injection method is less good because the new gene sometimes fails to join the embryo’s genes.
C、The retrovirus multiplies after it enters the cell.
D、The incorporating method is less simple but better.
答案
C
解析
根据“An alternative technique is...retrovirus that has been modified so it cannot reproduce itself after entering a cell.”可知C为正确答案。
转载请注明原文地址:http://tihaiku.com/zcyy/4040161.html
相关试题推荐
Theproceduresfollowedbyscholarsstudyingliteratureareoftenunsatisfac
Theproceduresfollowedbyscholarsstudyingliteratureareoftenunsatisfac
Theproceduresfollowedbyscholarsstudyingliteratureareoftenunsatisfac
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Mostpeoplewouldbeimpressedbythehighqualityofmedicineavailableto
Mostpeoplewouldbeimpressedbythehighqualityofmedicineavailableto
Mostpeoplewouldbeimpressedbythehighqualityofmedicineavailableto
______,hedidbecomeannoyedwithherattimes.(清华大学2005年试题)A、Muchasheliked
Here,soprofligatehasitsusebecometheairconditionerisalmost______theau
随机试题
Nowadaysthesponsorshipfeehasbeenanopensecret.Tosendthechildtoa
Businessandgovernmentmanagersoftenpromote"cleandesk"policiestoavoidd
Thestarhasbeenplayingbasketball______hewasaboy.A、duringB、whenC、since
寒冷地区设计采暖系统时,错误的做法应是下列哪几项?A.燃气红外线辐射器安装在地面
影响牙石形成的因素是()A.口腔卫生习惯 B.修复体的光洁度 C
金融期货中率先出现的是( )。A.股票指数期货 B.利率期货 C.外汇期货
钢板桩格形围堰按挡水高度不同,其平面形式有( )。 A、圆筒形格体 B、
关于公文正文首段,下列说法不正确的是:() A.“经过”一词改为“经”
尽管西方音乐在某些观念和理论上可追溯至古希腊时期,但真正孕育并影响西方音乐长达千
A、B两个期货交易所合并成立C期货交易所,关于合并前A、B的债权债务,下列说法正
最新回复
(
0
)