31 What was the function of the genes Dr. Windbichler and Dr. Crisanti engineered into A. gambiae mosquitoes?
(A)They copied the chromosome of their host.
(B)They repaired the chain of transmission of malaria.
(C)They damaged the DNA sequences of the particular chromosome.
(D)They helped reproduce the X chromosome of A. gambiae.

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統計： A(12), B(31), C(199), D(30), E(0) #1150830

詳解 (共 5 筆)

#3680966
Kill the mosquito and you kill the disease. That is the usual approach to controlling malaria瘧疾. And if done properly正確地；合適地, it works.
The problem is that the insecticides殺蟲劑 employed to do the killing destroy lots of other things as well.
An old dream of those who seek to eliminate排除；消除；清除 malaria瘧疾 is thus a way of selectively有選擇性的；嚴格篩選的 killing only what transmits 播送，發射 the parasite寄生生物；寄生動物: mosquitoes of the genus種 Anopheles（传布疟疾寄生虫的）, most notably格外地，特別地, 明顯地 Anopheles gambiae岡比亞瘧蚊.
And that, more or less大約；幾乎, is what is proposed提議 by Nikolai Windbichler and Andrea Crisanti of Imperial College, London, in a paper in Nature Communications.
They think they have worked out how to stop A. gambiae岡比亞 females being created in the first place.
That would break the chain of transmission in two ways: immediately立刻, because it is only females that drink blood and so pass the parasite寄生蟲 on; and in the longer term because without females a population cannot reproduce. 
       The researchers’ trick计谋 is to engineer into the mosquitoes a gene for a protein蛋白質 called a homing endonuclease自返核酸內切酶.
These genes are peculiar獨特的，特有, and are probably a type of genetic parasite寄生生物；寄生動物.
They cut particular sequences序列 of DNA in a way that damages the chromosome染色體 such DNA is found in.
In extreme cases, that destroys the chromosome染色體. (In less extreme cases, the process of repair often copies the endonuclease核酸內切酶 gene into the repair修理；修補 site; hence the name “homing,” and also the suspicion懷疑，猜想 of parasitism寄生.) 
       Dr. Windbichler and Dr. Crisanti have found a homing endonuclease自返核酸內切酶 in a species of slime mould黴菌 that, by a strange coincidence, cuts a sequence順序 of DNA found repeatedly in the X chromosome染色體 of Anopheles gambiae岡比亞瘧蚊, destroying the chromosome染色體 completely.
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#3680968

What was the function of the genes Dr. Windbichler and Dr. Crisanti engineered into gambiae岡比亞 mosquitoes? 

(A)They copied the chromosome染色體 of their host主人. 

(B)They repaired the chain of transmission傳遞 of malaria瘧疾. 

(C)They damaged the DNA sequences序列 of the particular chromosome染色體. 

(D)They helped reproduce複製 the X chromosome染色體 of A. gambiae岡比亞. 

 

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#3687723
原本題目:請依下文回答第 29 題至第 ...
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#1273001
原本題目:請依下文回答第 29 題至第 ...
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#1268965
31. What was the function of the genes Dr. Windbichler and Dr. Crisanti engineered into A. gambiae mosquitoes? 
A)They copied the chromosome of their host. 
B)They repaired the chain of transmission of malaria.
C)They damaged the DNA sequences of the particular chromosome. 
D)They helped reproduce the X chromosome of A. gambiae.
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