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
Gene therapy and gene based drugs are two ways we could benefit from our growing mastery of genetic science. But there will be o
Gene therapy and gene based drugs are two ways we could benefit from our growing mastery of genetic science. But there will be o
admin
2011-01-10
17
问题
Gene therapy and gene based drugs are two ways we could benefit from our growing mastery of genetic science. But there will be others as well. Here is one of the remarkable therapies on the cutting edge of genetic research that could make their way into mainstream medicine in the coming years.
While it’s true that just about every cell in the body has the instructions to make a complete human, most of those instructions are inactivated, and with good reason: the last thing you want for your brain cells is to start churning out stomach acid or your nose to mm into a kidney. The only time cells truly have the potential to turn into any and all body parts is very early in a pregnancy, when so called stem cells haven’t begun to specialize.
Yet this untapped potential could be a terrific boon to medicine. Most diseases involve the death of healthy cells—brain cells in Alzheimer’s, cardiac cells in heart disease, pancreatic cells in diabetes, to name a few; if doctors could isolate stem cells, then direct their growth, they might be able to furnish patients with healthy replacement tissue.
It was incredibly difficult, but last fall scientists at the University of Wisconsin managed to isolate stem cells and get them to grow into neural, gut, muscle and bone cells. The process still can’t be controlled, and may have unforeseen limitations; but if efforts to understand and master stem cell development prove successful, doctors will have a therapeutic tool of incredible power.
The same applies to cloning, which is really just the other side of the coin; true cloning, as first shown with the sheep Dolly two years ago, involves taking a developed cell and reactivating the genome within, resetting its developmental instructions to a pristine state. Once that happens, the rejuvenated cell can develop into a full fledged animal, genetically identical to its parent.
For agriculture, in which purely physical characteristics like milk production in a cow or low fat in a hog have real market value, biological carbon copies could become routine within a few years. This past year scientists have done for mice and cows what Ian Wilmut did for Dolly, and other creatures are bound to join the cloned menagerie in the coming year.
Human cloning, on the other hand, may be technically feasible but legally and emotionally more difficult. Still, one day it will happen. The ability to reset body cells to a pristine, undeveloped state could give doctors exactly the same advantages they would get from stem cells: the potential to make healthy body tissues of all sorts, and thus to cure disease. That could prove to be a true "miracle cure".
The word "rejuvenated" (para. 5) most probably means ______.
选项
A、modified
B、recollected
C、classified
D、reactivated
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/GncO777K
本试题收录于:
NAETI中级口译笔试题库外语翻译证书(NAETI)分类
0
NAETI中级口译笔试
外语翻译证书(NAETI)
相关试题推荐
Whenpeoplehavenowilltolive,peopleareoftenverydifficulttohelp.
Thefeelingofcompetitionamongthestudentsinalltheclassroomswherethetestwasgoingonwasnoticeabletoeveryone.
Nowwhicharetheanimalsreallytobepitiedincaptivity?First,thosecleverbeingswhoselivelyurgeforactivitycanfindn
OfalltheemployedworkersintheUnitedStates,12.5millionarepartofatemporaryworkforce.TheUnitedStatesBureauofLa
Thetorchwas______byafamousathleteattheopeningofthesportmeeting.
Aphysicalexaminationisa______tojoiningthearmy.
BenjaminFranklinwasrememberedforhisgoodjudgment.
IntheUnitedStates,olderpeoplerarelylivewiththeiradultchildren.Butinmanyothercultureschildrenareexpectedtoca
不论某些人如何试图为猎狐这项运动开脱;事实却是;屠杀动物只是为了给人提供娱乐。
A、15yearsago.B、1981.C、TheSecondWorldWar.D、Notmentioned.C
随机试题
新婚蜜月期间,民警岳某接到单位电话就匆匆离家,十五天后才返回,面对妻子的刨根问底与埋怨责怪,岳某总报以深情微笑,饱含歉意地说:“我也很想待在家里,好好陪陪你,可我是警察.守护百姓和万家安宁是警察的责任!”民警岳某的行为,最能体现人民警察职业道德规范的:
晉靈公不君,厚斂以彫墙;從臺上彈人而觀其辟丸也;宰夫胹熊蹯不孰,殺之,置諸畚,使婦人載以過朝。趙盾、士季見其手,問其故而患之。將諫,士季曰:“諫而不入,則莫之繼也。會請先,不入,則子繼之。”三進及溜,而後視之,曰:“吾知所過矣,將改之。”稽首而對曰:“人誰
影响白细胞总数增多或减少,主要是
甲为了杀害乙,购买一把匕首,在家反复打磨,使匕首锋利无比。后觉得刀杀把握不大,决定改为毒杀,又购买了若干种剧毒农药。后来觉得不够稳妥,改用爆炸方法,为此从外地私下购买了10公斤烈性炸药、数十支雷管,乘长途客车带回家中。最后决定选用枪杀方法,为此偷来1支手枪
()市场是指一国保险市场业同时存在两家或两家以上的保险公司,各垄断某一地区的保险业务,相互问业务没有交叉的情况。
哪一项不是行为改变技术的策略?( )。
设X1,X2,…,Xn是取自正态总体N(μ,σ2)的一个样本,其中σ2未知,检验假设H0:μ=μ0,H1:μ≠μ0.则选取的统计量及其拒绝域分别是().
Whydoestheideaofprogressloomsolargeinthemodernworld?Surelybecauseprogressofaparticularkindisactually【C1】___
ThetroubledU.S.-Canadarelationshipmightbefixedby______.
Thereportersexposedthecorruptionofseveralseniorofficersinthegovernment;consequently,theseofficers______toresign
最新回复
(
0
)