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
2024-01-22
25
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/3384857.html
相关试题推荐
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
AnimalsontheMoveA)Itlookedlikeascenefrom"Jaws"
Researchershaveidentified1.4millionanimalspeciessofar—andmillionsre
Researchershaveidentified1.4millionanimalspeciessofar—andmillionsre
Researchershaveidentified1.4millionanimalspeciessofar—andmillionsre
Researchershaveidentified1.4millionanimalspeciessofar—andmillionsre
随机试题
Writeanoteofabout50~60wordsbasedonthefollowingsituation:Lastw
为保证评标质量,招标人应根据工程项目的(),合理确定评标时间。A.招标计划 B
梅尼埃病主要病理改变是A.蜗管扩张 B.球囊扩张 C.膜迷路积水 D.囊壁
关于全国股转系统挂牌的要求,以下表述正确的是()。A.依法设立且存续满两年,.
受体只需与很低浓度的配体结合就能产生显著的效应,此特征称为A.特异性 B.敏感
甲、乙、丙三个单位各派2名志愿者参加公益活动,现将这6人随机分成3组,每组2人,
装卸工艺的基本要求包括( )。 A.装卸工艺流程应力求简单,操作环节少,机
根据《镇规划标准》的规定,不属于城镇规划的建设用地标准的是()。A.建设用
卡臂尖位于基牙倒凹区,可以A.防止义齿龈向脱位 B.防止义齿向脱位 C.防止
关于复合式衬砌防水层施工的错误说法是()。A.复合式衬砌防水层施工应优先选用射
最新回复
(
0
)