首页
登录
职称英语
Many people dream of having a smarter brain. Princeton neurobiologist Josep
Many people dream of having a smarter brain. Princeton neurobiologist Josep
游客
2023-12-07
35
管理
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." [br] 【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://tihaiku.com/zcyy/3251129.html
相关试题推荐
[originaltext]Woman:Well,itseemsquitecommonactually.LotsofpeopleinAu
Ensuringanadequatewatersupplyhavebeenaconcerneversincepeoplebeganto
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
Healthyadultstakeapproximately10-14breathsperminute,butsomepeople
PositiveforYouthaimstoplaceteenagersandyoungpeopleatitsheart.Th
PositiveforYouthaimstoplaceteenagersandyoungpeopleatitsheart.Th
随机试题
Tworelatedparadoxesalsoemergefromthesamebasicconceptionoftheaes
[originaltext]W:Stan,doyouhaveaminute?M:Oh,hi,Cathy.Sure.What’sup?
()电信网()因特网服务提供商[br]()下线()垃圾邮件N、H
TheworkforwhichThomasMalthusisstillmostwidelyknownishisEssayon
下列属于物流战略管理主要特征的有()。A.目的性 B.系统性 C.风险性
项目经理小李对某活动工期进行估算时,发现人员的熟练程度和设备供应是否及时对工期至
2002-151.哮证的病因是 A.宿痰内伏B.外邪侵袭C.饮食不当D
某大学教授认为,用西方思想来消解中国的传统文化成了“五四”新文化运动先驱们的有效
下列关于商用房地产和居住房地产押品分类的是()。A.房地产类在建工程 B.商
某企业为增值税一般纳税人,在建工程领用自产柴油成本50000元,应纳消费税
最新回复
(
0
)