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
2025-04-06
9
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] 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
“to become commercially available”指的是在商业上实际可用。因此D项正确。
转载请注明原文地址:https://tihaiku.com/zcyy/4028526.html
相关试题推荐
Ascomputersecuritysystemsbecomeevenmoreadvanced,______themethodsoftho
Native-places,whichtranscendnationalboundariestobecomecentraltothe
Native-places,whichtranscendnationalboundariestobecomecentraltothe
Shehasbecomequite______tothecompany.A、influentialB、compulsoryC、indispen
AstheAmericanworkforcegetsgrayer,agediscriminationwilllikelybecome
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetocc
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetocc
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetocc
随机试题
[originaltext]M:WhatdoyoudoinclasswhenstudentsdonotspeakEnglishbut
Millennials(千禧世代)aretakingtelecommuting(远距离工作)toawholenewlevel.Theyv
______isamournful,melancholyorplaintivepoem,especiallyalamentforthed
"Howthezebragothisstripes"soundslikethetitleofoneofRudyardKipl
关于胆道系统的叙述错误的是()。A.胆汁全部由肝细胞分泌 B.胆囊24h可
根据合同法律制度的规定,下列表述正确的是()。A.合同的变更,不仅对变更后未履行
关于熊彼特创新理论的描述错误的是()。A.熊彼特关于经济周期的解释是建立在创新
Whatcanyoudotoensurethatyouwill
重氮化反应的酸度条件是A.HCl酸性 B.HNO酸性 C.H2SO酸性 D
A.薄荷 B.广藿香 C.青蒿 D.细辛 E.蒲公英叶呈心形至肾状心形,
最新回复
(
0
)