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【单选题】
下列关于大肠杆菌 DH5α 说法错误的是A.
是野生型大肠杆菌
B.
是突变型大肠杆菌
C.
与 pUC 载体匹配可用蓝白斑筛选
D.
可作为外源基因克隆和表达的宿主
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】If corn farmers know that the demand for corn is inelastic, and they want to increase their total revenue, they should all
A.
a. plant more corn so that they would be able to sell more each year.
B.
b. increase spending on fertilizer in an attempt to produce more corn on the acres they farm.
C.
c. reduce the number of acres they plant in corn.
D.
d. contribute to a fund that promotes technological advances in corn production.
【单选题】大众帕萨特电动车窗系统控制电路当驾驶人员按下左前电动车窗开关E40至第一格时,( )。
A.
驾驶侧车窗手动上升或下降
B.
驾驶侧车窗自动上升或下降
C.
左后车窗上升或下降
D.
右后车窗上升或下降
【单选题】当驾驶人按下左前电动车窗开关E40至第一格时,( )
A.
驾驶侧车窗手动上升或下降
B.
驾驶侧车窗自动上升或下降
C.
左后侧车窗手动上升或下降
D.
左后侧车窗自动上升或下降
【简答题】已知实数 满足 则 的最小值是 ；
【单选题】In 2012, Canadian farmers did not suffer from drought conditions that affected the United States, but they did enjoy the higher corn prices. Canadian farmers reacted to the higher price by planting mo...
A.
perfectly inelastic.
B.
unit elastic.
C.
elastic.
D.
inelastic.
【单选题】Suppose that when the price of corn is $2 per bushel, farmers can sell 10 million bushels. When the price of corn is $3 per bushel, farmers can sell 8 million bushels. Which of the following statement...
A.
The demand for corn is price elastic, and so an increase in the price of corn will increase the total revenue of corn farmers
B.
The demand for corn is price inelastic, and so an increase in the price of corn will increase the total revenue of corn farmers
C.
The demand for corn is income elastic, and so an increase in the price of corn will increase the total revenue of corn farmers
D.
The demand for corn is income inelastic, and so an increase in the price of corn will increase the total revenue of corn farmers
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