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
Many people dream of having a smarter brain. Princeton neurobiologist Joseph Z. Tsien found the key. In September he announced
Many people dream of having a smarter brain. Princeton neurobiologist Joseph Z. Tsien found the key. In September he announced
admin
2015-02-17
37
问题
Many people dream of having a smarter brain. Princeton
neurobiologist Joseph Z. Tsien found the key. In September he
announced that he built a better mouse by altering a gene that 【M1】______
affects learning and memory. A similar process of gene
manipulation might conceivably be used one day to boost up 【M2】______
intelligence in humans.
The secret lies in a feature of brain cells which called the 【M3】______
nomda receptor, which Tsien likes to a cylindrical tube or window 【M4】______
that mediates the flow of information. When the window is open,
chemicals called neurotransmitters flow through easily and
memory is registered or stored. Tsien noticed that the receptor 【M5】______
worked more efficiently when teamed with the gene NR2B, so he
introduced extra NR2B genes into a batch of fertilized mouse eggs.
In a normal mouse, the memory window is open in just 【M6】______
150-thousandths of a second. In Tsien’s specifically engineered 【M7】______
mice, the window opens for 250-thousandths of a second, long
enough to make a remarkable impression in memory retention. 【M8】______
When he pitted his mice with common mice, they won paws down. 【M9】______
Ordinary mice could recognize a Lego block for 12 hours, but
smart mice could remember the block for up to three days. "That’s
a profound enhancement," Tsien says.
Can it be done with humans? Maybe, so genetic engineering 【M10】______
will have to make some extraordinary advances first. And some
thorny ethical issues will have to be resolved. Meanwhile, Tsien
promises to keep his furry little geniuses locked up in a lab, far
from your larder. "Otherwise," he says, "you might need a smart cat
or a smart mousetrap to catch them."
【M5】
选项
答案
or—and
解析
连词使用错误。本句中的记录与储存并不是选择性关系,而是并列关系,即两者同时发生,这一点从下文的试验介绍中能清楚地看出。
转载请注明原文地址:https://kaotiyun.com/show/SYdO777K
0
专业英语八级
相关试题推荐
Englishisoneoftheworld’smostwidelyspokenlanguages.ThisispartlybecauseitwasthelanguageoftheBritishEmpire.T
Languageisfantasticallycomplex.Itsbuilt-inmeansofcombiningandrecombining(nesting)ofitsvariouslevelshave【M1】______
Engaginginahobbylikereadingabook,makingapatchworkquiltorevenplayingcomputergamescandelaytheonsetofdementi
Engaginginahobbylikereadingabook,makingapatchworkquiltorevenplayingcomputergamescandelaytheonsetofdementi
Engaginginahobbylikereadingabook,makingapatchworkquiltorevenplayingcomputergamescandelaytheonsetofdementi
Theavailabilityoffoodandprobably,tolesserextent,thedegreeof【M1】______dangerfrompredatorsaretwobasicinfluences
Inthe1960s,medicalresearchersThomasHolmesandRichardRahedevelopedacheck-listofstressfulevents.Theyappreciatedt
ComputerCrimeⅠ.IntroductionCurrentsituation:theincreaseinnumberandtypeofcomputercrimeⅡ.Featuresofc
HenryFielding’s______indicatesthegenreofnovelhasgottothematureperiod.
1ConsidertheseresultsfromastudyreleasedlastweekbytheManhattanInstitute,aNewYork-basedthinktank:Two-thirds
随机试题
在Word2010中_____视图主要用于设置文档和显示标题的层级结构,并可以方便地折叠和展开各种层级的文档。
胎盘能分泌大量的孕激素与雌激素。
符合羧基特征的是
A、卡托普利B、胺碘酮C、普鲁卡因胺D、普罗帕酮E、盐酸维拉帕米属于延长动作电位时程的抗心律失常药的是()
各项资产应按照取得时支付的实际成本计量,其后不得自行调整其账面价值,这遵循的是会计要素确认计量原则中的()原则。
(2016年)R国W公司于2002年发行了名为Pioneer的巨灾债券。该债券能够同时为北美飓风、欧洲风暴以及美国加利福尼亚和日本地震提供救灾资金保障。这种具有金融衍生品特性的债券,属于风险管理策略工具中的()。
甲公司于2×16年取得乙公司40%股权,实际支付价款为7000万元,投资时乙公司可辨认净资产公允价值为16000万元(各项可辨认资产、负债的公允价值与账面价值相等),取得投资后甲公司能够对乙公司施加重大影响。乙公司2×17年度实现净利润1600万元,其中包
《导游人员管理条例》规定,导游人员资格证书是由国家旅游局统一印制的,由()颁发的。
北府兵
简述节奏、速度与旋律。
最新回复
(
0
)