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
Dolly the clone (克隆羊多利) was born a lamb, but her chromosomes (染色体) tell a differen story. They say she was already a few years o
Dolly the clone (克隆羊多利) was born a lamb, but her chromosomes (染色体) tell a differen story. They say she was already a few years o
admin
2012-07-18
27
问题
Dolly the clone (克隆羊多利) was born a lamb, but her chromosomes (染色体) tell a differen story. They say she was already a few years old by the time she left her mother’s womb.
Scientists at the Roslin Institute in Scotland finally took a close look at Dolly’s chromosomes and found that their ends, or telomeres(端粒—染色体端位上的着色点), are shorter than those of normal sheep of Dolly’s age. Telomeres, scientists think, are a major factor in aging—the shorter they are, the closer the cell is to dying.
The scientists also looked at the telomere length of two other sheep, one cloned from a 9-day-old embryonic cell(受孕的胚胎细胞) and the other from a 25-day -old fetal cell. The sheep cloned from the 9-day -old cell had the longest telomeres of the three, suggesting that the key factor in determining telomere length seems to be the number of divisions the cell undergoes before being cloned.
All three clones appear to be healthy, and whether the animals will have a shorter life span as a result of their shorter telomeres remains an open question. But the shortened telomeres do suggest that genetic blueprints may wear out over time, making it impossible to clone an animal endlessly.
Dolly will live longer than an ordinary lamb.
选项
A、Right.
B、Wrong.
C、Doesn’t say.
答案
C
解析
原文没有提供题句概括所应具有的信息。
转载请注明原文地址:https://kaotiyun.com/show/n2ld777K
本试题收录于:
公共英语一级笔试题库公共英语(PETS)分类
0
公共英语一级笔试
公共英语(PETS)
相关试题推荐
Ispenttenyuanonthatbook.Thebook______tenyuan.
Themothersaidtotheboy:"Don’tgooutatnight."Themotheraskedtheboy____________gooutatnight.
Onedayamanwentintoachemist’sshop(药店)andsaid,"Haveyouanythingtocureaheadache?"Thechemisttookabottlefromas
Eachoneofus______anicepencil-box.
Aswintercomes,theweatherisgetting______.
Bytheendoftheweek,Lora______severalclothes.
Thewintercomes,bringingcoldandcleanairtous.The______bringscoldandcleanairtous.
BobandJimonceworkedinthesamefactory.Oneday,BoblentJimtendollars,butthenJimlefthisworkandwanttoworkina
Theclimate(气候)isveryspecialinEngland.Thereisnotagreat【B1】betweensummerandwinter.Besides,it【B2】alotinEngland
随机试题
沙叶新(1939一),回族,生于江苏南京。代表作有多幕话剧______、______、______等。______获1980—1981年“全国优秀剧本创作奖”和“全国少数民族文学创作奖”。
在论证过程中,如果论据实际证明的论题不是论证所设立的论题,就叫犯了_______的逻辑错误。
网络视频采用了“流媒体技术”,可以边下载边播放影片。
上前牙的牙体长轴向近中倾斜角度由小到大排列正确的是A.中切牙、侧切牙、尖牙B.中切牙、尖牙、侧切牙C.侧切牙、尖牙、中切牙D.侧切牙、中切牙、尖牙E.尖牙、中切牙、侧切牙
社会因素影响人类健康的途径有
关于流行性腮腺炎,下列叙述不正确的是( )。
(2008)图示结构支座a发生沉降值,则正确的剪力图是()。
面对投资者时,FOFs充当()角色,为投资者管理资金并选择PE基金再投资。
()是大宗交易者利用电脑网络直接进行交易的市场。
操作系统对磁盘进行读/写操作的单位是()。
最新回复
(
0
)