题目内容

If deproteinized viral nucleic acid was added to cells, which would be able to make virus?

A. parainfluenza virus
B. rabies virus
C. poliovirus
D. measles virus

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The process by which bacteriophage P1 packages random phage-genome-sized pieces into phage heads and thereby allows transfer of pieces of the bacterial chromosomal DNA between bacteria is called

A. generalized transduction
B. non-general transposition
C. specialized transduction
D. high-frequency recombination
E. None of the above

The viral DNA of the temperate phage, instead of taking over the functions of the cell’s genes, is incorporated into the host DNA and becomes a prophage in the bacterial chromosome, acting as a gene. This happens in

A. lysogeny
B. spontaneous induction
C. lytic phase
D. adsorption
E. none of these

有限个无穷小的和仍然是无穷小。

A. 对
B. 错

在自由贸易区的基础上，所有成员统一对非成员国的进口关税或其他贸易政策措施的国际经济一体化形式是（）。

A. 自由贸易区
B. 关税同盟
C. 共同市场
D. 经济联盟