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【单选题】
关于T4DNA连接酶错误的说法是( )A.
既能连接黏性末端，也能连接平末端
B.
从T4噬菌体感染的大肠杆菌中纯化得来
C.
用NAD+作为能源辅助因子
D.
在基因克隆中广泛应用
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举一反三
【简答题】根部吸收的矿质元素向上运输主要通过 ,也可横向运到 后再向上运输。
【单选题】Suppose the country of Quasiland experienced a decrease in real GDP and people were laid off from their jobs. The people would be considered part of
A.
frictional unemployment.
B.
structural unemployment.
C.
cyclical unemployment.
D.
discouraged workers.
【单选题】Suppose country A, a labor-abundant country, produces only wheat and cloth. The following equations illustrate the prices and costs of wheat and cloth in the country, where the numbers indicate the am...
A.
purchase more of both cloth and wheat than in the absence of trade
B.
purchase more wheat but less cloth than in the absence of trade.
C.
purchase less of both cloth and wheat than in the absence of trade.
D.
purchase more cloth but less wheat than in the absence of trade
【单选题】Suppose country A, a labor-abundant country, produces only wheat and cloth. The following equations illustrate the prices and costs of wheat and cloth in the country, where the numbers indicate the am...
A.
the real income of the landowners will increase but that of the laborers will remain unchanged.
B.
the purchasing power of the laborers will increase but that of the landowners will decline.
C.
the real income of both the landowners and the laborers will decline.
D.
the purchasing power of both the landowners and the laborers will increase.
【单选题】Suppose the country of Dingo experienced an economic trough in January 2011. We can conclude that
A.
real GDP in Dingo was increasing in January 2011.
B.
an expansion occurred after January 2011.
C.
Dingo did not experience a recession in 2010.
D.
Dingo's potential GDP fell in 2011.
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