题目内容

The defective viruses are due to defect of

A. spikes
B. capsid
C. genome
D. viral enzyme

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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

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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 defective viruses are due to defect of

A. spikes B. capsid C. genome D. viral enzyme

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

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

A. spikes
B. capsid
C. genome
D. viral enzyme