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
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