首页
登录
职称英语
[originaltext] Researchers at Harvard Medical School’s affiliated Hebrew Sen
[originaltext] Researchers at Harvard Medical School’s affiliated Hebrew Sen
游客
2023-08-16
91
管理
问题
Researchers at Harvard Medical School’s affiliated Hebrew SeniorLife Institute for Aging Research say smoking leaves a long-term signature on DNA.
(23)"Our study has found compelling evidence that smoking has a long-lasting impact on our molecular machinery, an impact that can last more than 30 years," said Roby Joehanes, first author on the study. "The encouraging news is that once you stop smoking, the majority of DNA methylation signals return to never smoker levels after five years, which means your body is trying to heal itself of the harmful impacts of tobacco smoking. "
Ailments, including heart disease and cancer, are believed to be at least partially caused by damage to the DNA.
(24)For the study, the researchers looked at blood samples from 16,000 people. They found that for most, the DNA damage caused by smoking faded for people who had kicked the habit for five years. Some of the damage appeared to be permanent.
The damage to DNA is a result of a process called methylation, which changes how DNA functions, possibly leading to cancer and other illnesses. The researchers say that smokers, among those studied, saw changes to more than 7,000 genes or about one-third of known human genes.
"These results are important because methylation, as one of the mechanisms of the regulation of gene expression, affects what genes are turned on, which has implications for the development of smoking-related diseases,"(25)said Dr. Stephanie J. London, last author and deputy chief of the epidemiology branch at the National Institute of Environmental Health Sciences, National Institutes of Health. " Equally important is our finding that even after someone stops smoking, we still see the effects of smoking on their DNA. "
Smoking is the leading cause of preventable illness and kills an estimated 480,000 Americans annually, the Centres for Disease Control and Prevention said. Smoking is believed to take the lives of more than 6 million people every year across the globe, mostly through cancer, heart disease and lung disease.
In the United States, smoking levels have dropped considerably, with only an estimated 15 percent of the adult population engaging in the habit.
Questions 23 to 25 are based on the recording you have just heard.
23. According to Roby Joehanes, what has the study found?
24. What did the researchers do for the study?
25. What did Dr. Stephanie J. London say about the people who stopped smoking?
选项
A、They checked the lungs of 16,000 people.
B、They examined the heartbeats of 16,000 smokers.
C、They measured the blood pressure of 16,000 smokers.
D、They looked at blood samples from 16,000 people.
答案
D
解析
转载请注明原文地址:http://tihaiku.com/zcyy/2929878.html
相关试题推荐
[originaltext]ResearchersatHarvardMedicalSchool’saffiliatedHebrewSen
[originaltext](19)Peoplewholiveinareaswithpollutedairincreasethei
[originaltext](19)Peoplewholiveinareaswithpollutedairincreasethei
[originaltext](19)Peoplewholiveinareaswithpollutedairincreasethei
[originaltext]StockpricesretreatedonFridayfollowinganotherweakUSjo
[originaltext]StockpricesretreatedonFridayfollowinganotherweakUSjo
[originaltext](12-1)Swedishfathersfromnextyearwillreceiveathirdmo
[originaltext]Watchinganotherpersonshivercancauseourowntemperature
[originaltext]Watchinganotherpersonshivercancauseourowntemperature
[originaltext]Watchinganotherpersonshivercancauseourowntemperature
随机试题
Thenewregulationsforthesector____________(即将实施).aretobeputintoeffec
Forthispart,youareallowed30minutestowriteashortessay.Youshouldsta
[originaltext]M:So,Doron,whatdidyoudolastValentine’sDay?W:LastVale
A1999reportbytheUniversityofMichiganshowedthatabout62percentofhigh
烘烤、熬炼、蒸馏使用明火加热炉时,应用砖砌实体墙完全隔开。烟道、烟囱等部位与可燃
下面关于规训形态舞蹈的功能表达正确的一项是:()A.泛群体的世俗生活与信仰生活
(请作答此空)是构成我国保护计算机软件著作权的两个基本法律文件。单个自然人的软件
机器字长为n位的二进制可以用补码来表示()个不同的有符号定点小数。A.2
根据《全国中小企业股份转让系统挂牌公司信息披露指引——软件和信息技术服务公司》,
证券市场中介机构是指()。A.从事证券的发行与交易的机构 B.为证券的发行、
最新回复
(
0
)