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
2024-01-22
34
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] Why is AFP not widely used?
选项
A、It is only found in the blood offish that lives in colder seas.
B、The technology to utilize AFP has yet to be improved upon.
C、The protein will not be safe for another 30 years.
D、Countries such as Canada and Japan want to do more research first.
答案
B
解析
细节题。短文第三段中间指出yet few of the technologies that use the AFPexist today即现在能利用AFP的技术还很少。故选项B正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3384780.html
相关试题推荐
[originaltext]Apoisonousfishwhichhasastingstrongenoughtokillahuman
IsthereenoughoilbeneaththeArcticNationalWildlifeRefuge(ANWR)tohelp
IsthereenoughoilbeneaththeArcticNationalWildlifeRefuge(ANWR)tohelp
Somefishcanswiminwaterbelow0°C,lowenoughtofreezethebloodofmos
Somefishcanswiminwaterbelow0°C,lowenoughtofreezethebloodofmos
[originaltext] NotenoughAmericanstudentswanttobeengineers,mathematicia
[originaltext] NotenoughAmericanstudentswanttobeengineers,mathematicia
[originaltext] NotenoughAmericanstudentswanttobeengineers,mathematicia
Quittingsmokingishardenoughonitsown,butstudiesshowthechallengei
Quittingsmokingishardenoughonitsown,butstudiesshowthechallengei
随机试题
GratefulPeopleAreHappierandHealthierItturnsoutt
A"memorypill"thatcouldaidexamrevisionandhelptopreventpeopleforg
ConradHiltonreallywantedtobeabanker.Instead,hesuccessfullychanged
装配式结构属于()子分部工程。A.木结构 B.混凝土结构 C.钢结构 D.
2009年4月我国城乡零售价格同比上涨最多的商品是()。 A.烟酒B.日
建筑材料采购合同的验收依据包括()。A、供货方提供的发货单、计量单、装箱单及
阅读下面材料,回答问题。 某年12月5日9时45分,某地发生4.8级有感地震,
功用为透邪解郁、疏肝理脾的方剂是( )。A.四逆散 B.逍遥散 C.痛泻要
会员如对结算结果有异议,应在下一交易日开市前30分钟内以书面形式通知()。A.
现金日记账的借方是根据收款凭证登记的,贷方是根据付款凭证登记的。()
最新回复
(
0
)