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
11
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:https://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
下列关于集合竞价的说法,正确的有()。A、集合竞价采用最大成交量原则B、高于集合竞价产生的价格的买入申报全部成交C、低于集合竞价产生的价格的卖出申报
车辆进入山区道路后,要特别注意“连续转弯”标志,并主动避让车辆及行人,适时减速和
在运输业总产值的计算中,旅客托运的行李包裹收入从性质上说属于( )。A.货运收
A.急性血肿 B.亚急性血肿 C.梗死 D.水肿 E.慢性血肿TWI和T
在现场抢救急性中毒患者时,护士首先应采用的排出毒物的方法是A.造瘘口洗胃 B.
(2011年)《测绘计量管理行办法》规定,测绘单位使用未经检定,或者检定不合格或
1994-10.任脉的终点是 A.目内侧B.目眶下C.口唇D.上
国家股是指有权代表国家投资的部门或机构以国有资产向公司投资形成的股份,包括()。
证监会在其2010年《投资顾问业务暂行规定》中,把()作为证券公司有偿专
(2018年真题)根据《民法典》规定,法人成立须具备的条件有( )。A.有自己
最新回复
(
0
)