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
专升本
Imagine an animal that becomes frozen in cold weather. Then, when it gets warmer, the animal simply unfreezes and goes back to i
Imagine an animal that becomes frozen in cold weather. Then, when it gets warmer, the animal simply unfreezes and goes back to i
admin
2018-04-13
39
问题
Imagine an animal that becomes frozen in cold weather. Then, when it gets warmer, the animal simply unfreezes and goes back to it$ 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 (葡萄糖). 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.
What effect does the glucose produced in the wood frog’ s body have?
选项
A、It stops the water in the frog’ s cells from freezing in cold weather.
B、It lowers the temperature in the spaces between the frog’ s cells.
C、It causes the frog’ s cells to produce more starch.
D、It allows the frog’ s cells to produce more water.
答案
A
解析
推理判断题。故选A。
转载请注明原文地址:https://kaotiyun.com/show/EcWC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
Foxesandfarmershavenevergotonwell.Thesesmalldog-likeanimalshavelongbeenaccusedofkillingfarmanimals.Theyare
Morethanfortythousandreaderstolduswhattheylookedforinclosefriendships,whattheyexpected【C1】______friends,whatth
Morethanfortythousandreaderstolduswhattheylookedforinclosefriendships,whattheyexpected【C1】______friends,whatth
Nowputonsunscreen(防晒霜)Somesunscreenspreventsunburnbutnotothertypesofskindamage.Makesureyoursoffersabroadrang
TheforestfromwhichMantakeshistimberisthetallestandmostimpressiveplantcommunityonEarth.IntermsofMan’sbrief
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywillalmostcertainlymentionrecycling.Recyclingin
Successfulinnovationshavedrivenmanyoldertechnologiestoextinctionandhaveresultedinhigherproductivity,greaterconsu
Incitieswithrentcontrol,thecitygovernmentsetsthemaximumrentthatalandlordcanchargeforanapartment.Supporterso
Jean-FrancoisMillet(October4,1814-January20,1875)wasaFrenchpainterwhowasfamousforhisscenesoffarmers.After
YouareheretoseeBillGates,theChairmanandChiefSoftwareArchitectofMicrosoftCorporation.Asyouknow,Microsoftisth
随机试题
Ineveryschoolthereisa"top"crowdthatsetsthepace,whiletheothersfollowtheirexample.Let’ssaythetopcrowddecide
吗啡与哌替啶比较,下列哪项是错误的
施工单位使用国家明令淘汰、禁止使用的危及施工安全的工艺、设备、材料造成事故应按照刑法137条规定处理。
下列房地产估价报告存在多处错误,请指明其中的13处1.房地产估价报告项目名称:××市×××区××东街××号商业用房征收补偿价格评估报告估价委托人:××市房屋征收管理办公室估价机构:××市房地产估价有限公司估价人员:×
运输合同中法律关系的客体是()。
关于会计凭证的归档保管,下列表述中错误的是()。
下列各项中,符合消费税纳税地点规定的有()。
Planningisaveryimportantactivityinourlivesyetreallysophisticated.Itcangivepleasure,evenexcitement,【C1】______ca
TheyoungeststateinAustraliais______.
A、Theparcelcounterischeaper.B、Hiscounterisnotresponsibleforthewoman’sparcel.C、Heisoffdutynow.D、Hehasnoperm
最新回复
(
0
)