首页
登录
职称英语
Some fish can swim in water below 0°C, low enough to freeze the blood of mos
Some fish can swim in water below 0°C, low enough to freeze the blood of mos
游客
2023-07-05
21
管理
问题
Some fish can swim in water below 0°C, low enough to freeze the blood of most creatures. However, some fish and insects can stay alive in the freezing water. One key to survival is a special protein in the fish’ s blood. The chemical is called the Antifreeze Protein, otherwise known as AFP and is commonly found in fish that live in cold waters.
What does AFP do in these fish? First, we need to understand what happens when water freezes. When the temperature of the water drops below -1.0°C, tiny particles of ice start forming in the water. Each particle becomes larger and then sticks to other particles, forming blocks of ice. Fish take in this water and tiny particles of ice also form inside a fish’s body. However, the AFP in the blood of the fish surrounds these particles, preventing them from sticking together to form bigger pieces of ice.
The application of AFP is promising. For example, AFP can be used to alter the taste and texture of ice-cream. It can also be used to store meat and vegetables more effectively by protecting food products from the formation of ice. Another application is in medical field, as AFP can help preserve organs for transplantation without freezing them. Scientists have known about AFP for more than 30 years, yet few of the technologies that use the AFP exist today. The process of getting the necessary amount of AFP from fish to make products was only recently discovered. Some companies in the United States and Canada have already made products using AFP, but they have yet to become popular. Although some researchers in Japan discovered that some local fish contained AFP and succeeded in creating AFP in the laboratory, more research is necessary. AFP tests will continue for these fish out of the water. [br] How does AFP work?
选项
A、It covers the small ice particles so that they remain separated from each other.
B、It turns ice back into water by breaking down ice piece by piece.
C、It allows the fish to find places in the ocean that have warmer temperatures.
D、It forms a protective layer around the fish’ s body, keeping it warmer.
答案
A
解析
细节题。文章第二段最后指出the AFP in the blood of the fish surroundsthese particles,preventing them from sticking together to form bigger pieces of ice,选项A表述与原文接近,故选A。
转载请注明原文地址:https://tihaiku.com/zcyy/2811799.html
相关试题推荐
[originaltext]Formanypeopletryingtoshedafewkilos,it’shardenough
[originaltext]Formanypeopletryingtoshedafewkilos,it’shardenough
Walking,ifyoudoitvigorouslyenough,istheoverallbestexerciseforre
Walking,ifyoudoitvigorouslyenough,istheoverallbestexerciseforre
Walking,ifyoudoitvigorouslyenough,istheoverallbestexerciseforre
Walking,ifyoudoitvigorouslyenough,istheoverallbestexerciseforre
Walking,ifyoudoitvigorouslyenough,istheoverallbestexerciseforre
Walking,ifyoudoitvigorouslyenough,istheoverallbestexerciseforre
Whileit’seasyenoughtobrushoffafewsleeplessnightswithapotofcof
Whileit’seasyenoughtobrushoffafewsleeplessnightswithapotofcof
随机试题
WhatisMissBarnes’job?[br][originaltext]M:MissBarnes,Iunderstandthat
Whatdoesthenewsitemmainlytalkabout?[br][originaltext](6)Theformer
[originaltext]Millionsofpeoplearestrugglingtounderstandtheirpaychec
某男患者,65岁。患胃癌四年,晚期,已失去手术治疗价值,生命垂危。家属再三恳求医
蜜丸的制备工艺流程为()。A.物料准备→制丸条→分粒→搓圆→整丸B.物料准备→
A.矩形横截面轴 B.椭圆横截面轴 C.圆形横截面轴 D.各种形状横截面轴
某15层框架-剪力墙结构,其平立面示意如图3-16所示,质量和刚度沿竖向分布均匀
住宅室内消火栓系统干式消防竖管的管径宜选择下列()。A.DN100 B.DN
与大承气汤相比,小承气汤少了A.大黄 B.芒硝 C.芍药 D.炙甘草
关于正常体温波动的叙述,错误的是 A.早晨体温略低,下午体温.略.高B.运动
最新回复
(
0
)