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【单选题】
胞嘧啶脱氨基后转变成尿嘧啶,经过下一轮的DNA复制,产生UA配对的子链。该链再经过一轮复制, 会产生UA配对的子链,和TA配对的子链。因此,最终胞嘧啶脱氨基所导致的是( )。A.
DNA复制
B.
CU互换
C.
碱基颠换
D.
原来的CG配对，经过两轮复制以后，成为TA配对
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皮皮学刷刷变学霸
举一反三
【单选题】In a recession when income and wealth are falling, the demand for bonds ________ and the demand curve shifts to the ________.
A.
rises; right
B.
rises; left
C.
falls; right
D.
falls; left
【单选题】In a recession when income and wealth are falling, the demand for bonds _________ and the demand curve shifts to the _________.
A.
falls; left
B.
falls; right
C.
rises; right
D.
rises; left
【判断题】A recession occurs when real GDP declines for two successive quarters in a row
A.
正确
B.
错误
【单选题】In a recession when income and wealth are falling, the demand for bonds _________ and the demand curve shifts to the _________.
A.
falls; right
B.
falls; left
C.
rises; right
D.
rises; left
【单选题】Bill is a high-school drop out who lost his job in a fast food restaurant when the economy plunged into a recession. After 8 months, Bill is still looking for work. He is an example of
A.
frictional unemployment.
B.
structural unemployment.
C.
cyclical unemployment.
D.
the natural unemployment rate
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