题目内容

What is the compound X-gal? __________

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

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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

根据学生参与运动学习和身体锻炼的心理动因指向于体育活动过程还是指向于体育活动的结果,可以将运动动机分为( )和间接动机。

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