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
18
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] 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
本题的依据句是“An alternative technique is…retrovirus that has been modified so it cannot reproduce itself after entering a cell.”因此C为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/4016479.html
相关试题推荐
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Anewbiotechnologyprocedurethatcouldbecomecommerciallyavailableinas
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetocc
Whowouldhavethoughtwewouldbecomeaplanetof"ologies"?There’sbiology
Whowouldhavethoughtwewouldbecomeaplanetof"ologies"?There’sbiology
Whowouldhavethoughtwewouldbecomeaplanetof"ologies"?There’sbiology
Whowouldhavethoughtwewouldbecomeaplanetof"ologies"?There’sbiology
Ifyoubecomereconciledtoyourlot,youwillnevergetanewstartinlife.A、s
Whendid"TheOprahWinfreyShow"becomenationallypopular?[originaltext]O
随机试题
交通运输结构是指各种交通运输方式内外部各个方面的构成和联系。外部是指各种交通运输
高层建筑内设有固定座位的观众厅,其疏散走道、出口等的要求是( )。A.疏散出口
测定水中微量氟,最适合的方法是( )。A.沉淀滴定法 B.络合滴定法
专用铁路货物运杂费的收费项目和收费标准管理权限归属于()。A.铁路局集团有限公
社会舆论是医德评价的重要方式之一,下列除哪一项之外,都是可取的()A.有
患儿2岁,入托体检发现HBsAg阳性,HBeAg阳性,抗-HBc阳性,肝功能正常
根据协定价格与标的物市场价格的关系.我们可以把期权分为()。 Ⅰ.看涨期权
六淫之中只有外感而无内生的邪气是A.暑 B.寒 C.风 D.火 E.湿
有关肝脏药物代谢酶,不正确的是A.肝药酶位于肝细胞内质网B.多种药物可受同一种酶
发行人经营方面存在的风险包括:经营模式发生变化,经营业绩不稳定,过度依赖某一重要
最新回复
(
0
)