题目内容

In screening for pUC8 recombinants, which color colonies will be the desired recombinants? ___________

A.Blue
B.Colorless
C.White
D.Yellowish

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What is the compound X-gal? __________

A.Plasmid
B.Lactose analog
C.Antibiotic
D.Inducer

Which is the most common ligand in Western blotting? __________

A.Lactose
B.Toxins
C.Genes
D.Antibodies

Following the fixation step in blotting, the membrane is placed in RNA or DNA sequence which is _____________ to blot-transferred DNA.

A.Toxic
B.Complementary
C.Larger in size
D.Similar

在某放大电路中三极管工作在放大状态，测的三极管三个电极的静态电位分别为0 V，-10 V，-9.3 V，则这只三极管是（）。

A. NPN 型硅管
B. NPN 型锗管
C. PNP 型硅管
D. PNP 型锗管