首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Clone Farm Factory farming could soon enter a new era of mass production. Companies in the US are developing the technology
Clone Farm Factory farming could soon enter a new era of mass production. Companies in the US are developing the technology
admin
2012-12-22
47
问题
Clone Farm
Factory farming could soon enter a new era of mass production. Companies in the US are developing the technology needed to "clone" chickens on a massive scale. Once a chicken with desirable traits has been bred or genetically engineered, tens of thousands of eggs, which will hatch into identical copies, could roll off the production lines every hour. Billions of clones could be produced each year to supply chicken farms with birds that all grow at the same rate, have the same amount of meat and taste the same.
This, at least, is the vision of the US’s National Institute of Science and Technology, which has given Origen Therapeutics of Burlingame, California, and Embrex of North Carolina $ 4.7 million to help fund research. The prospect has alarmed animal welfare groups, who fear it could increase the suffering of farm birds.
That’s unlikely to put off the poultry industry, however, which wants disease resistant birds that grow faster on less food. "Producers would like the same meat quantity but to use reduced inputs to get there. " says Mike Fitzgerald of Origen. To meet this demand, Origen aims to "create an animal that is effectively a clone", he says. Normal cloning doesn’t work in birds because eggs can’t be removed and implanted. Instead, the company is trying to bulk-grow embryonic stem cells taken from fertilized eggs as soon as they’re laid. "The trick is to culture the cells without them starting to distinguish, so they remain pluripotent. " says Fitzgerald.
Using a long-established technique, these donor cells will then be injected into the embryo of a freshly laid, fertilized recipient egg, forming a chick that is a "chimera". Strictly speaking, a chimera isn’t a clone, because it contains cells from both donor and recipient. But Fitzgerald says it will be enough if, 95 percent of a chicken’s body develops from donor cells. "In the poultry world, it doesn’t matter if it’s not 100 percent. " he says.
Another challenge for Origen is to scale up production. To do this, it has teamed up with Embrex, which produces machines that can inject vaccines into up to 50,000 eggs an hour. Embrex is now trying to modify the machines to locate the embryo and inject the cells into precisely the right spot without killing it.
In future, Origen imagines freezing stem cells from different strains of chicken. If orders come in for a particular strain, millions of eggs could be produced in months or even weeks. At present, maintaining all the varieties the market might call for is too expensive for breeders, and it takes years to bread enough chickens to produce the billions of eggs that farmers need.
In the third paragraph, by saying "Producers would like the same meat quantity but to use reduced inputs to get there". Mike Fitzgerald means that he wishes ______
选项
A、chickens’ quality could be maintained but with less investment.
B、chickens’ taste could be improved but at less costs.
C、chickens’ growth rate could be quickened but with less inputs.
D、chickens could grow to the same weight but with less feed
答案
D
解析
原文中Mike Fitzgerald说,养殖者想用更少的饲料喂出同样重量的鸡。选项A、B、C意思都不符,而选项D指鸡的体重不变,但给的饲料更少。只有D指鸡的体重,因此最符合题意。
转载请注明原文地址:https://kaotiyun.com/show/2fUd777K
本试题收录于:
职称英语综合类A级题库职称英语分类
0
职称英语综合类A级
职称英语
相关试题推荐
StudentsLearnBetterwithTouchscreenDesksObservethecriticismsofnearlyanymajorpubliceducationsystemintheworld
LifetimeEmploymentinJapaneseCompaniesInmostlargeJapanesecompanies,thereisapolicyoflifetimeemployment.Whatt
MusicalTrainingCanImproveCommunicationSkillsAmericanscientistssaymusicaltrainingseemstoimprovecommunicationsk
MusicandDrivingListeningtoloudmusicwhiledrivingcanseriouslyhamperreactiontimesandcauseaccidents,newresearc
WhatdoesProfessorLibbrechtbelievetobetrue?Itcanbefeltfromthedescriptioninthe2ndparagraphthattheauthor
Accordingtothepassage,parentsshouldhelptheirchildrenwiththeirhomework.Governmentalsupportalsoplaysaroleinach
Traditionalworkersshowednointerestinmanagement.Beforeclosing,aplantshouldputupanoticeandkeepitfor90days.
Herfigurewasslenderandgraceful,herfeaturesgood.
Didyoudothattoirritateher?
随机试题
下列肉制品中属于腌腊制品的是________。
解决直流感性负载通断引起干扰的方法是在感性负载两端安装(B)、压敏电阻、(D)等。
A.胃阴不足B.脾胃虚寒C.痰饮中阻D.胆热犯胃E.食积内腐呕吐出苦水、黄水者,属
施工单位拒不整改或者不停止施工,工程监理单位未及时向有关主管部门报告的,逾期未改正的,责令停业整顿,并处( )的罚款。
以下关于施工质量计划内容的说法正确的是()。
如果假设检验中的P值=0.015,则说明原假设是真的概率为0.015。()[2014年中级真题]
E集团公司总部位于北京,其经营范围涉及多个领域,主要有保健品、白酒、室内设计装修和生态旅游四个业务单元。随着社会进步和经济发展,人们对自身的健康日益关注。90年代以来,全球居民的健康消费逐年攀升,对营养保健品的需求十分旺盛。在按国际标准划分的15类国际化产
学习过程中,人的精神状态和注意力变化的一般模式有()。
上网需要在计算机上安装()。
Ifyoudevelopareputationforbeingabletokeepsecretsotherswill______towardsyouwithusefulnewsandgossip.
最新回复
(
0
)