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
2024-02-06
14
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] 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
细节题。短文第二段中间指出This glucose,in turn,lowers the temperatureat which the liquid inside the frog’s cells freezes.意为这种葡萄糖可以降低wood frog细胞液体结冰的温度。由此可知这种葡萄糖使细胞里的水不会结冰,故选A。
转载请注明原文地址:https://tihaiku.com/zcyy/3427005.html
相关试题推荐
[originaltext]Whenfarmersandwildanimalsshareland,conflictscanbeha
Someanimalsarewidelyusedinexperiments______(尽管有些人对此表示反对).eventhoughsome
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
[originaltext]W:Wow!(19)Therearesomanychoices!ThereareanimalshereI’ve
[originaltext]W:Wow!(19)Therearesomanychoices!ThereareanimalshereI’ve
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
It’swellknownthatbiganimals,likepolarbears,aresensitivetoclimate
随机试题
Imagineaworldinwhichchildrenwouldbetherulersandcoulddecidenoto
Inmyopinion,youcanwidenthe______oftheseimprovementsthroughyouractiv
以下不属于实行多级压缩的优点的为()。A.能大大提高活塞上所受的气体力,减轻
患者,男,41岁。头面丹毒,红肿,恶寒发热,口渴,便秘溲黄,舌红苔黄,脉洪数。其
人们偶然看到天上的白云,会下意识地脱口说出它像棉絮、小山等。这属于()。A.无意
关于创业投资的相关概念,表述错误的是()A.创业企业,通常指处于创建或重建过程
排油及注氮管道安装前应检查管道内壁防锈漆无脱落,做好现场(____)措施。(A)
《变电运维管理规定第1分册油浸式变压器(电抗器)运维细则》:有载调压变压器并列运
关于闭合性气胸的特点,不正确的是( )。A.空气能自由进出胸膜腔 B.胸膜裂
A企业是高新技术企业,拟于2021年3月给予对企业科技成果研发和产业化作出突
最新回复
(
0
)