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
医学
A、Because it vaporizes easily. B、Because it becomes overactive easily. C、Because it is usually in injection form. D、Because it i
A、Because it vaporizes easily. B、Because it becomes overactive easily. C、Because it is usually in injection form. D、Because it i
admin
2018-02-26
50
问题
A team of Australian chemistry students have strengthened the chemical bonds of insulin to make it stable even at warm temperatures—a breakthrough that could simplify diabetes management. The finding could shed light on how insulin works and eventually lead to insulin pills, rather than injections or pumps.
Insulin needs to be kept cold because it is made of weak chemical bonds that degrade at temperatures above 40 degrees Fahrenheit, making it inactive. But using a series of chemical reactions, the research team, comprised of students from Monash University in Australia, replaced the unstable bonds with stronger, carbon-based ones.
The stronger bonds stabilize the insulin’s two protein chains without interfering with its natural activity, according to a story about the findings at SciGuru. The so-called "dicarba" insulins were stable at room temperature for several years, SciGuru says.
Even more promising is that the findings provide insight into how insulin works.
People with Type 1 and Type 2 diabetes do not produce enough insulin, whether it’s the result of an auto-immune disorder that stops producing it entirely (Type 1) or a condition brought on by other factors like obesity, in which the body can no longer use it properly (Type 2). Insulin is the mechanism that delivers glucose from the blood to the cells, so diabetics must take a synthetic form of the hormone.
When insulin unlocks cells to allow sugar to be taken up from the blood, the hormone’s shape changes — but no one is sure what the shape looks like. If researchers knew that shape, they could design smaller, less-complex versions of insulin that don’t use proteins.
Then it could be administered in pill form rather than directly into the bloodstream. Understanding the molecule’s chemical bonds is a step toward unlocking that shape, the researchers say.
21. What is the main idea of the talk?
22. Why does insulin need to be kept cold, according to the talk?
23. What makes the research more promising?
24. What is true about the new type of insulin?
25. What is unknown to the scientists, according to the talk?
选项
A、Because it vaporizes easily.
B、Because it becomes overactive easily.
C、Because it is usually in injection form.
D、Because it is not stable above 40 degrees Fahrenheit.
答案
D
解析
此题为细节信息题。题目问胰岛素要在低温下保存的原因。根据原文信息胰岛素的化学结构较弱,在高温下会使得胰岛素失效,因而答案为D。
转载请注明原文地址:https://kaotiyun.com/show/EPT3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
女,45岁,间歇性右上腹痛伴皮肤巩膜黄染,发热10天,加重3天入院。治疗期间突然出现寒战、高热,体温39.4℃,神志淡漠,面色苍白,皮肤厥冷,手足冰冷,脉率125次/分,血压70/45mmHg。根据患者的临床表现,其目前应处于
女,60岁,因右胸剧烈疼痛,上眼睑下垂,瞳孔缩小,经X线摄片见右上肺尖有-3cm×2cm叶状阴影,少量胸腔积液,胸腔积液涂片检到癌细胞,应首选
37岁女性患者,反复水肿1年,临床诊断为慢性肾小球肾炎,血压180/105mmHg,尿蛋白(+),红细胞(++),血肌酐102gmol/L。血红蛋白105g/L。除饮食疗法外,目前该患者最主要的治疗措施应是
Severalclassesofbittercitruscompoundhavelookedpromisingasanticanceragentsinlaboratorytests.Anewstudyindicates
Ihadneverbeeninthepublicwardofahospitalbefore,anditwasmyfirstexperienceofdoctorswhohandleyouwithoutspeak
Despitegrowingnumbersofjoggers,CanadaFitnessSurveysacrossthecountrydemonstratethatCanadiansarelessphysicallyfit
ManyCanadiansenjoytheluxuryofalargeamountoflivingspace.Canadaisvast,andthehomesarelargeaccordingtothestan
Twoequallybrilliantscientistsapplyforaprestigiousresearchfellowshipawardedbyatopscientificorganization.Oneiswh
PleasereadthefollowingarticleinChinesecarefully,andthenwriteasummaryof200wordsinEnglishontheANSWERSHEET.Ma
A、Herdaughterlikesballgames.B、Herdaughterisanexcitingchild.C、Sheandherdaughteraregoodfriends.D、Sheandherdau
随机试题
塞补方法使用的塞头材料和铸件材料应()。
主要来自于建筑材料的室内污染物是
李某,女,30岁,咯血反复发作1个月,血色鲜红,呛咳气急,痰少质黏色黄,午后潮热,盗汗,两颧潮红,消瘦,舌红绛少津,苔薄黄,脉细数。诊断为()。
某土石坝坝高70m,坝基为砂砾石,其厚度为8.0m,该坝对渗漏量损失要求较高,根据《碾压式土石坝设计规范》DL/T5395—2007,以下哪种渗流控制形式最合适?
某县地税稽查局接到群众举报称某酒店有偷税行为,稽查局立案后于20×5年5月20日派两名稽查员对该酒店实施了检查,稽查员在出示税务检查证和税务检查通知书后,对该酒店的账簿及记账凭证进行了核查;同时经市地税局局长批准,对案件涉嫌人员的储蓄存款进行了查询。查实该
违反《旅行社条例》的规定,旅行社未经旅游者同意在旅游合同约定之外提供其他有偿服务的,由旅游行政管理部门责令改正,处2万元以上5万元以下的罚款。()
目前,很多汽车的驾驶室里装有一个叫GPS接收器的装置。GPS接收器通过接收卫星发射的信号,实现对车辆的精确定位并导航。卫星向GPS接收器传送信息依靠的是:
以下关于路由器的路由表说法正确的是()。Ⅰ路由表包含目的网络和到达该目的网络的完整路径Ⅱ路由表必须包含子网掩码Ⅲ目的网络和到达该目的网络路径上的下一个路由器的IP地址Ⅳ目的网络和到达该目的网络路径上的下一个路
Marie:Yourlittleboyhasdoneagoodjobatschool.Eva:_____
Grandfatherhadsustainedabrokenbackwhileworkinginthemines.______,hespenttherestofhislifeinawheelchair.
最新回复
(
0
)