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
外语
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
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
admin
2015-01-31
28
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.
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://jikaoti.com/ti/Fc4FFFFM
0
大学英语四级
相关试题推荐
FormanyAmericans,summerisatimetoputonswimwearandspendtimeattheseaoralake.Butbeforegoinganywhere,theyma
A、Screamandcry.B、Hideunderbeds.C、Fleethehouse.D、Seektheirparents’help.B短文提到家里发生火灾时,儿童经常会感到恐慌,常常会躲在衣柜或床底,B与此相符,故为正确答
ToHelptheKids,ParentsGoBacktoSchoolA)Forafewyearsnow,everyparentofanewbornbabyintheSouthFloridadistrict
BarackandMichelleObamaunderstandtheheavyburdenofstudentloandebt.TheObamasdidnotpayofftheirstudentloansuntil
Lookingforanewweightlossplan?Trylivingontopofamountain.Mountainaircontainslessoxygenthanairatloweraltitud
Duringthenineteenthcentury,whenlittlewasknownaboutenvironmentalismandconservation,itwascommontohearpeopleinEu
Oneinsix.Believeitornot,that’sthenumberofAmericanswhostrugglewithhunger.Tomaketomorrowalittlebetter,Feedin
Forthispart,youareallowed30minutestowriteashortessayentitledStylesofLivingfollowingtheoutlinegivenbelow.Yo
Whenwasthelasttimeyouflashedafakesmileattheoffice?Forsome,itmaybejustanothermundane(乏味的)aspectofworklife—
A、Sports.B、Travel.C、Foreignlanguages.D、Computergames.B细节辨认题。对话中女士询问男十有什么特殊技能和兴趣;男士回答说他擅长计算机,并能讲西班牙语.并且说他喜欢旅行。由此可知,男士对旅行比较感
随机试题
A.HBsAgB.抗-HBsC.HBeAgD.抗-HBeE.抗-HBc能保护人体,防止乙肝病毒感染()
甲、乙为朋友。乙出国前,将自己的借记卡(背面写有密码)交甲保管。后甲持卡购物,将卡中1.3万元用完。乙回国后发现卡里没钱,便问甲是否用过此卡,甲否认。关于甲的行为性质,下列哪一选项是正确的?
市场包括市场的主体和客体,市场主体通常指()。
在波长为λ的驻波中两个相邻波节之间的距离为()。
特殊附加险主要有()。
心理辅导的辅导员与接受辅导的学生之间的关系()。
波斯纳认为经验的反思非常重要,基于此,他提出了一个教师成长公式:______。
从众:指个人的观念和行为由于群众的引导或压力,而向多数人相一致的方向变化的现象。以下不是从众现象的有()。
在SQLServer2008的某数据库中,设用户U1同时是角色R1和角色R2中的成员。现已授予角色R1对表T具有SELECT、INSERT和UPDATE权限,授予角色R2对表T具有INSERT和DENYUPDATE权限,没有对U1进行其他授权,则U1
Hereareninefail-proof(奏效的)waystoensureyourfamily’sfinancialwell-being.WhattoDoToday"Yourdad’sinabadway.
最新回复
(
0
)