题目内容

Reverse transcriptase is an enzyme unique to the retroviruses.Which one of the following is a function of the reverse transcriptase?

A. DNase activity
B. RNA-dependent RNA polymerase activity
C. Integration activity
D. RNA-dependent DNA polymerase activity

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Viruses enter cells by adsorbing to specific sites on the outer membrane of cells. Each of the following statements regarding this event is correct EXCEPT

A. The interaction determines the specific target organs for infection
B. The interaction determines whether the purified genome of a virus is infectious
C. The interaction can be prevented by neutralizing antibody
D. If the sites are occupied, interference with viral infection occurs

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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

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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

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Reverse transcriptase is an enzyme unique to the retroviruses.Which one of the following is a function of the reverse transcriptase?

A. DNase activity B. RNA-dependent RNA polymerase activity C. Integration activity D. RNA-dependent DNA polymerase activity

Viruses enter cells by adsorbing to specific sites on the outer membrane of cells. Each of the following statements regarding this event is correct EXCEPT

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

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

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. DNase activity
B. RNA-dependent RNA polymerase activity
C. Integration activity
D. RNA-dependent DNA polymerase activity