超星 - 病毒感染与致病机制--章节练习

单选题

The ability of a virus to produce disease can result from a variety of mechanisms. Which one of the following mechanisms is LEASTlikely?

A. cytopathic effect in infected cells
B. malignant transformation of infected cells
C. immune response to virus-induced antigens on the surface of infected cells
D. production of an exotoxin that activates adenylate cyclase
E. apoptosis

查看答案

单选题

Reasonable mechanisms for viral persistence in infected individuals include all of the following EXCEPT

A. destroy ofimmune cells by viruses
B. virus-mediated inhibition of host DNA synthesis
C. integration of a provirus into the genome of the host
D. host tolerance to viral antigens
E. mutation of viral antigens

查看答案

单选题

Virus-infected cells often develop morphologic changes referred to as cytopathic effects. Which of the following statements about virus-induced cytopathic changes is most accurate?

A. They are pathognomonic for an infecting virus.
B. They are rarely associated with cell death.
C. They may include giant cell formation.
D. They can only be seen with an electron microscope.

查看答案

单选题

Laboratory infections can be acquired when working with viruses unless good laboratory safety practices are followed. Which of the following is not a good biosafety practice?

A. Use of biosafety hoods
B. Use of laboratory coats and gloves
C. Avoidance of pipetting by mouth
D. Flushing experimental waste down laboratory sink
E. Not eating or drinking in the laboratory

查看答案

单选题

Which one of the following is a fundamental principle of viral disease causation?

A. One virus type induces a single disease syndrome.
B. Many viral infections are subclinical and do not produce clinical disease.
C. The type of disease produced by a virus can be predicted by the morphology of that virus.
D. A particular disease syndrome has a single viral cause.
E. Social factors do not influence the occurrence of viral diseases.

查看答案

单选题

During the incubation period of an acute systemic virus infection, ( )

A. characteristic signs of virus infection appear
B. infectious virus cannot be isolated from any tissues
C. infectious virus cannot be shed
D. the host's immune response is stimulated by viral antigens
E. virus is limited to the site of inoculation

查看答案

单选题

Latency is an outcome particularly characteristic of which one of the following virus groups?

A. Polioviruses
B. Herpes viruses
C. Rhinoviruses
D. Influenza viruses

查看答案

单选题

Which one of the following virus can cause vertical transmission?

A. HAV
B. CMV
C. Influenza virus
D. Rabies virus
E. Japanese B encephalitis virus

查看答案