首页
登录
职称英语
To live forever was the dream of many emperors in ancient China. People was
To live forever was the dream of many emperors in ancient China. People was
游客
2025-04-21
28
管理
问题
To live forever was the dream of many emperors in ancient China. People was ordered to call them Wansui, which means 10 000 years, but no human could live that long. How long can humans really live? According to the latest scientific discovery, humans are able to live up to the age of 120 or perhaps even longer.
Several recent studies showed that our life span can be extended far beyond normal limits. Cynthia Kenyon, a professor at the University of California in San Francisco, doubled the life of a worm from two weeks to a month. By changing the function of a single gene, known as daf-2, the scientist not only added extra days to the worm’s life but also kept it as healthy as worms which were half its age.
There are two similar genes in the bodies of mammals. By changing the function of one gene, scientists extended the life of a mouse by 18 per cent (or 4. 5 months). Another gene is called IGF-1. Researchers still don’t know how it affects our body. But by reducing its functions, the life of a mouse increases by 33 per cent (or 8. 6 months). The average life span of a mouse is 26 months.
In the experiment of extending life,
an ancient saying
, ’’you are what you eat," also seems to be true. Vegetables contain fewer calories than meat, and help to prolong life, scientists say. Research has found that taking in fewer calories affects our lives in a similar way to reducing IGF-1.
US biologist John Phelan suggests low calorie diets could increase human life span, but there is no proof yet.
Researchers are still waiting for the results of a study started in 1987. Monkeys are fed with low calorie food to see what happens. A monkey’s typical life span is 40 years, so there is a little while to wait.
In China, average life expectancy has now reached 70, double that of 1949. Increasing the length of our lives may bring us closer to the dreams of our ancient emperors. But it may also cause social problems such as housing and employment, social scientists have warned. (360 words) [br] After the function of IGF-1 is changed, about how long will a mouse live?
选项
A、26 months.
B、30 months.
C、18 months.
D、35 months.
答案
D
解析
老鼠的平均寿命是26个月,改变IGF一1基因功能多活8.6个月,这就是说它能活34.6个月,D“36个月”与之最接近。
转载请注明原文地址:http://tihaiku.com/zcyy/4047674.html
相关试题推荐
ManypeoplewhohavenotvisitedBritaincallalltheinhabitantsEnglish,f
ManypeoplewhohavenotvisitedBritaincallalltheinhabitantsEnglish,f
ManypeoplewhohavenotvisitedBritaincallalltheinhabitantsEnglish,f
ManypeoplewhohavenotvisitedBritaincallalltheinhabitantsEnglish,f
ManypeoplewhohavenotvisitedBritaincallalltheinhabitantsEnglish,f
ManypeoplewhohavenotvisitedBritaincallalltheinhabitantsEnglish,f
ManypeoplewhohavenotvisitedBritaincallalltheinhabitantsEnglish,f
ManypeoplewhohavenotvisitedBritaincallalltheinhabitantsEnglish,f
ManypeoplewhohavenotvisitedBritaincallalltheinhabitantsEnglish,f
ManypeoplewhohavenotvisitedBritaincallalltheinhabitantsEnglish,f
随机试题
Astemptingasitcanbetoletitallhanglooseandstopworryingwhileon
Whichcompanyisdoingthisadvertisement?Topica’sOnlineMarketingand______.
Everyanimalisalivingradiator-heatformedinitscellsisgiven
根据《水利水电建设工程验收规程》(SL223-2008)的有关规定,单位工程完工
A.中精之府B.精明之府C.肾之府D.元神之府E.血之府胆为
公开招标是招标人以()的方式邀请不特定的法人或者其他组织参加投标的一种方式。A
药学是指A:医药分业和医院药房 B:药学科学和药学职业 C:药学科学和药事组
企业人力资源内部供给预测的方法包括( )。A.回归分析模型 B.人力资源信息
共用题干 某投资者李预期甲股票价格将会下跌,于是与另一投资者张订立卖出合约,合
关于阴道的描述错误的是A.为一肌性管道 B.是女性的性交器官 C.阴道穹后部
最新回复
(
0
)