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
2016-07-17
82
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, say, 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
原句的意思有两点是关键的,即每只鸡提供的肉量不变,但饲料(inputs)要减少。只有D符合原意。
转载请注明原文地址:https://kaotiyun.com/show/rILd777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
Thefoodisinadequatefortenpeople.
CulturalDifferencesPeoplefromdifferentculturessometimesdothingsthatmakeeachotheruncomfortable,sometimeswithou
CentersoftheGreatEuropeanCitiesThecentersofthegreatcitiesofEuropearemeetingplacesbytradition.Peoplegatherth
Inordertoimproveourstandardofliving,wehavetoaccelerateproduction.
MiddleAge:ALowPointforMostPeoplearoundtheglobehittheheightoftheirmiseryanddepressioninmiddle【51】______,
Thefirstparagraphindicatesthatmoreoftenthannotacomapatient______.Howdidtheauthorfeeluponfirsthearingwhatth
ItcameassomethingofasurprisewhenDiana,PrincessofWales,madeatriptoAngolain1997,tosupporttheRedCross’scamp
Helackedthestrengthtodealwithalltheseproblems.
InEnglandfootballisagameenjoyed______.Accordingtothepassage,whichofthefollowingisNOTtrueofthefootballgame
Johniseligibleforthisjob.
随机试题
乳腺大部分淋巴液回流途径是【】
试述淫羊藿、巴戟天、仙茅功用异同。
肺心病的诊断依据是
在选择电力变压器分接头和调压方式时,下列规定哪些是正确的?
机关或部门的领导人对来文办理提出处理意见的活动是收文处理中的()。
2009年3月2日,经国务院批准,自2009年起,每年5月12日为全国()。
要充分挖掘人才、合理调配人才和高效使用人才,使人才在适宜的环境中成长和发挥作用,这体现了教育人事行政的()。
下列说法正确的是()。
考生文件夹下存在一个数据库文件“samp2.accdb”,里面已经设计好“tEmp”和“tGrp”两个关联表对象及表对象“tBmp”和“tTmp”。试按以下要求完成设计:创建一个查询,要求给出提示信息“请输入需要删除的职工姓名”,从键盘输入姓名后,删除
Thewholepassagedealswith______.Thearticlegivesusapiecegoodadviceabouthowtoevaluateyourchild’sworkathome.
最新回复
(
0
)