首页
登录
职称英语
Imagine an animal that becomes frozen in cold weather. Then, when it gets wa
Imagine an animal that becomes frozen in cold weather. Then, when it gets wa
游客
2023-07-05
29
管理
问题
Imagine an animal that becomes frozen in cold weather. Then, when it gets warmer, the animal simply unfreezes and goes back to its normal life. Although this may sound like something from a science-fiction movie, it is exactly what happens to the wood frog over winter and spring. When winter begins, the frog, which is found throughout much of Canada, buries itself in leaves and dirt. As the ground begins to freeze, so does the frog’ s body.
Normally, if a living creature is frozen, the cells inside its body are destroyed, leading to death. How, then, does the wood frog survive? The secret lies in the fact that although the water between the cells in the frog’ s body becomes frozen, the water inside the cells does not freeze. Before the winter begins, the frog stores starch in its body. As the weather gets colder, the drop in temperature causes the frog’ s body to change this starch into glucose. This glucose, in turn, lowers the temperature at which the liquid inside the frog’s cells freezes. As a result, the cells do not freeze even at very low temperatures, allowing the frog to stay alive. Some wood frogs stay in this frozen state— with their hearts stopped completely—for months without harm.
Now researchers are hoping to adapt the wood frog’ s secret to help them preserve human organs for transplants. Currently, after organs are removed from a donor’ s body, they are packed in a special liquid and kept very cold. However, they cannot be frozen because the ice would damage the cells in the organs. For this reason, the organs must be used quickly. If doctors had a way to preserve organs longer, they would have more time to find the best matches among people waiting for organ transplants.
There is still a lot about the wood frog that scientists do not understand. They still have to work out, for example, exactly how the frog is able to unfreeze itself and what actually restarts the frog’s heart when the weather becomes warmer. What is clear, however, is that lessons learned by studying this tiny creature could be of great benefit to humans in the near future. [br] Which of the following is true?
选项
A、The wood frog needs starch in order to stop the cells in its body from dying.
B、Researchers are trying to find a way to transplant the organs of wood frogs.
C、Wood frogs use the glucose in their cells to unfreeze their bodies at the end of winter.
D、Scientists are now using the process that takes place in a wood frog’s body to prepare human organs for transplant.
答案
A
解析
细节题。根据短文第二段对wood frog这种特殊能力的描述以及the frogstores starch in its body和This glucose…lowers the temperature…可知选项A正确.选项C错误:根据短文倒数第二段中researchers are hoping to adapt…help thempreserve human organs for transplants,由此可排除B、D。故选A。
转载请注明原文地址:https://tihaiku.com/zcyy/2810377.html
相关试题推荐
[originaltext]W:Wow!(9)Therearesomanychoices!ThereareanimalshereI’ve
[originaltext]W:Wow!(9)Therearesomanychoices!ThereareanimalshereI’ve
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
Protestsattheuseofanimalsinresearchhavetakenanewandfearfulchar
WhatIfYouCouldLearnEverything?A)Imagineeverystudenthas
随机试题
高中思想政治《财政促进社会公平》主要教学过程及板书设计 教学过程 环节一:课堂导入 多媒体展示下列地铁运送乘客的资料:想一想:修建地铁应该由谁来负责?
凡阳台、外廊、室内回廊、内天井、上人屋面及室外楼梯等临空处应设置防护栏杆,当临空
项目管理信息系统的合同管理功能应包括( )。A、合同基本数据查询 B、合同执
内服涌吐热痰、宿食、外用研末吹鼻,可引去湿热的药物是A.瓜蒂 B.常山 C.
共用题干 赵刚今年28岁,在中关村一家高科技公司上班,月薪4000元(税后,下
慢性阻塞性肺气肿失代偿期最主要的表现是A.充血性心力衰竭 B.肥厚型心肌病
编制城市规划这一行为属于行政行为中的( )。A.具体行政行为 B.抽象行政行
关于授权委托书的相关内容,下列描述不正确的是()。A、单位负责人或法定代表人可以
根据金融工具发行和流通的阶段,可将金融市场分为()。A.即期市场和远期市场
某建设项目施工合同约定,由承包人负责采购项目所需的断桥隔热门窗,现设计要求的质量
最新回复
(
0
)