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【单选题】
乳糖操纵子的表达中,乳糖的作用是 。A.
作为辅阻遏物结合了阻遏物
B.
作为阻遏物结合了操纵区
C.
使阻遏物变构而失去结合DNA的能力
D.
该操纵子结构基因的产物
E.
引物
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【单选题】?Read the article below about the shortage of talent in Asia. ?Choose the best sentence from the opposite page to fill each of the gaps. ?For each gap 8-12, mark one letter (A-G). ?Do not use any lett...
A.
However, there is also a failure of education.
B.
Philippine Airlines, for instance, lost 75 pilots to overseas airlines during the past three years.
C.
As it turned out, they ranked a shortage of qualified staff as their biggest concern in China and South-east Asia.
D.
There is also a severe shortage of good managers.
E.
The consequences of that are depressing and will limit the growth.
F.
But, in the meantime, there is a dreadful shortage of pilots.
G.
Asia has more than half the planet's inhabitants and is home to many of the world's fastest-growing economies. (8)
【单选题】母猪,4 岁,停止哺乳后一直未见发情,给予 GnRH 和 hCG 治疗无效,全身检查和血常规检查未见异常。治疗该病最适宜的药物是(2018 真题下 65)
A.
PGF2α
B.
eCG
C.
FSH
D.
PGE2
E.
PGP4
【简答题】阅读理解 Taylor Bernard and her twin sister were born 12 weeks early. As a result, Taylor suffers from cerebral palsy (CP). It is a condition that affects the brain. Kids who are born with CP have trouble...
【简答题】冈崎片段(Okazaki fragments)
【简答题】冈崎片段( Okazaki fragment )
【简答题】冈崎片段(Okazaki fragments)
【简答题】根据材料回答12~15题： A) To free his mind off work. B) To enrich himself. C) To make new friends. D) To kill the time.
【简答题】冈崎片段(Okazaki fragment)
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