DNA microarrays measure “absolute” mRNA expression levels without arbitrary reference standards, whereas SAGE indicates the relative expression levels.
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Which of the following is incorrect regarding 2D-Page?
A.It stands for Two-dimensional polyacrylamide gel electrophoresis
B.It separates proteins by charge only
C.The gel is run in one direction in a pH gradient under a non-denaturing condition
D.It works to separate proteins by isoelectric points (pI)
理想运算放大器的两个重要结论是（ ）。
A. 虚地与反相
B. 虚短与虚地
C. 虚短与虚断
D. 短路与断路
运放同相放大电路中，Rf=20kΩ，R1=10kΩ，则电压放大倍数为（）。
A. -2
B. -3
C. 2
D. 3
集成运放的输出级采用功率放大电路，能为负载提供一定的（ ）。
A. 功率
B. 电压
C. 电流
D. 电阻
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