首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
财务会计
根据下面资料,回答题 I′ve often wondered how exa
根据下面资料,回答题 I′ve often wondered how exa
昕玥
2019-12-17
58
问题
根据下面资料,回答题 I′ve often wondered how exactly sleep, or lack of it, can have such an awful effect on our bodies and, guess what, how much we sleep switches good genes on and bad genes off. In the first half of 2013, the Sleep Research Centre at the University of Surrey found a direct link between hours spent sleeping and genes. Every cell in our bodies carries genetic instructions in our DNA that act as a kind of operating handbook. However, each cell only "reads" the part of this handbook it needs at any given moment. Can sleep affect how a gene reads instructions It′s a question asked by Professor Derk-Jan Dijk at the University of Surrey. He set up an experiment and asked his volunteers to spend a week sleeping around seven and a half hours to eight hours a night and the next sleeping six and a half to seven hours. Blood samples were taken each week to compare which genes in blood cells were being used during the long and short nights. The results were rather surprising. Several hundred genes changed in the amount they were being used, including some that are linked to heart disease, cancer, and Type 2 diabetes. Genes to do with cell repair and replacement were used much less. Sleep restriction (six and a half to seven hours a night) changed 380 genes. Of these,220 genes were down regulated (their power was reduced), while 160 were up regulated (their power was increased). Those affected included body-clock genes which are linked to diabetes. One of the most downgraded genes is that which has a role in controlling insulin and is linked to diabetes and insomnia. The most upgraded gene is linked to heart disease. So changing sleep by tiny amounts can upgrade or downgrade genes that can influence our health and the diseases we suffer from when we sleep too little. The important message is that getting close to eight hours of sleep a night can make a dramatic difference to our health in just a few days through the way it looks after our genes. What can we learn about Professor Derk-Jan Dijk′ s experiment 查看材料
选项
A.The experiment was carried out to find the answer to how genes affect sleep.B.The experiment took a period of more than two weeks to reach a conclusion.C.His volunteers were divided into two groups with two different sleeping patterns.D.Blood samples of the volunteers were checked afterwards to decide how many genes changed in sleeping.
答案
B
解析
推断题。定位于第三段和第四段。根据第三段的第一句话“Can sleep affect how a gene reads instructions ”可知Derk-Jan Dijk教授的实验是为了发现睡眠对人体基因变化的影响.而不是基因影响睡眠,故A项不正确。根据第三段的最后一句话“He set up an experiment and asked his volunteers to spend a week sleeping around seven and a half hours to eight hours a night and the next sleeping six and a half to seven hours.”可知,他并没有将志愿者进行分组,而是要求他们第一周每晚睡七个半到八个小时,第二周将睡眠时间调整为六个半到七个小时,故C项不正确。再结合第四段的前两句话,他将志愿者这两周的血液样本进行比对,观察基因运作情况的不同.实验结果令人大吃一惊。由此可推断出,这个实验进行了两周多才得出结论,故B项正确,D项不正确,采集血液样品是为了比较在不同睡眠时长下所用到的基因的不同,而不是多少基因被改变。
转载请注明原文地址:https://ti.zuoweng.com/ti/vcUsKKKQ
相关试题推荐
男性,40岁,体检发现空腹血糖6.4mmol/L,此病人应首选下面哪项检查确诊
根据部位,下列哪种胃溃疡最为多见
某家工厂食堂,工人就餐1小时后,陆续出现唇、指甲以及全身皮肤青紫等症状。根据中毒
下面描述与汉坦病毒特征不符的是
男性,45岁,体检发现尿糖阳性,根据下列哪一项检查对诊断糖尿病最有意义
智能IC卡种类较多,根据IC卡芯片功能的差别可以将其分为()
根据工业炉热工制度分类,下列工业炉中属间断式炉的是()
2006—2014年我国能源消费总量及构成 根据材料,下列表述正确的是:
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项
2006—2014年我国能源消费总量及构成 根据材料,下列表述正确的是:
随机试题
\"梅核气\"与\"脏躁\"最早记载于 A.《临证指南医案.郁》 B.《金匮要略.妇
下列有关创伤后激素和细胞因子对代谢影响的描述,不正确的是 A.儿茶酚胺、皮质类
根据《中华人民共和国公司法》,股份有限公司的经理由()决定聘任或解聘。
某企业在确定产品产量指标时采取盈亏平衡分析法,盈亏平衡示意图见下图。该企业201
人体内外环境的统一性,中医学称为
知识点:胎动 提示小儿缺氧的胎动计数是 A.胎动:5次/12小时 B.胎
从世界范围看,汽车尾气是空气污染的重大因素。汽车尾气中含有( ),尤其是含铅汽油,对人体的危害更大。A.一氧化碳B.氧化氮C.氟气D..对人体产生
[交际用语]Hi,welcomeback!Haveanicetrip? ____________.AOh,fantastic!Fresh
患者,男性,32岁,左下肢红、肿、热、痛,边界不清,压痛明显,应首先考虑A.疖B.痈C.疽D.丹毒E.急性蜂窝织炎
直投子公司可以为客户提供与股权投资相关的()服务。 ①投资顾问工 ②投资管理 ③财务顾问 ④财务管理A.①②③B.②③C.①③D.①②③④