[简答题]Transposon(or transposable element)

[简答题]转座元件(transposable element)

[简答题]试述各类转座元件(transposable element)的结构特点及转座机制。

[简答题]简述转座因子(transposable element)的主要类型及特点，你认为转座因子在遗传学上有哪些应用价值

[简答题]PB transposon

[简答题]transposon; retrotransposon

[简答题]转座子(transposon，Tn)

[单项选择]Inventory
Inventory belongs to an important element of the cost of doing business in a large company. If a company is assembling cars, they must have a large number of parts in hand so that the assembly line does not stop because one part is missing. If cars are going down the assembly line and one person is supposed to fasten wheels on to the car, the whole line will stop if he runs out of fasteners. This means that several hundred men will be waiting while someone must find fasteners for the wheel. So there must be a sufficient number of parts of all sorts nearby in order to keep the car assembly line running smoothly.
A large supply of spare parts is very expensive, so a company will try to keep its inventory as low as it can without finding it necessary to stop production for lack of a part.
In a planned company, i.t was often difficult to secure spare parts and so many companies ordered many extra parts and kept large supplies of parts so that if a mistake was made
A. They try to keep their inventory of spare parts as low as possible.
B. The can save lots of money.
C. It’s a more efficient method of operating.
D. A, B and

[填空题]

No single element has tantalized and tormented the human imagination more than the shimmering metal known by the chemical symbol Au. For thousands of years the desire to possess gold has driven people to extremes, fueling wars and conquests, girding empires and currencies, leveling mountains and forests. (71) Yet its chief virtues—its unusual density and malleability along with its imperishable shine—have made it one of the world’s most coveted commodities, a transcendent symbol of beauty, wealth, and immortality. From pharaohs (who insisted on being buried in what they called the "flesh of the golds") to the forty-niners (whose mad rush for the mother lode built the American West) to the financiers (who, following Sir Isaac Newton’s advice, made it the bedrock of the global economy); (72)
Humankind’s feverish attachment to gold shouldn’t have survived the modern world. Few cultures still believe that gold ca

[填空题]The most important element for an economic system is ______.

[简答题]应答元件(response element)

[单项选择]