Sunday, April 18, 2010

MCQ: Virology 2

11. viruses that contain two complete copies of positive strand RNA and the enzyme reverse transcriptase are:
a. Toga viruses b. rhabdoviruses c. retroviruses d. reoviruses
e. Enteroviruses
12. the time from adsorption of a bacteriophage to release of newly synthesized bacteriophage is generally
a. 1-5 minutes b. 20-40 minutes c. 1-4 hours d. 6-24 hours
e. 1-2 days
13. bacteriophages that can enter into stable, long-term relationships with their hosts are called:
a. Lytic phages b. Defective phages c. virulent phages d. lazy phages
e. Temperate phages
14. the positive strand of certain viruses does not act as a message but becomes converted into DNA and integrated into the host cellular DNA. These viruses are
a. Rhinoviruses b. enteroviruses c. retroviruses d. reoviruses
e. Picornaviruses
15. infants infected with cytomegaloviruses (CMV) in utero may suffer from:
a. Mental retardation b. enlarged spleen c. liver damage d. any of these
e. none of these
16. viroids are unusual in that they:
a. have no capsid protein or envelops b. contain RNA c. are barely visible with the light microscope d. can cause disease in plants e. are retroviral
17. creutzfeldt-Jakob disease (CJD) , kuru, scrapie, and Mad Cow disease are caused by:
a. Viroids b. Retroviruses c. DNA viruses d. Prions
e. RNA viruses
18. the human virus that has been associated with Burkett’s lymphoma ( a malignant tumor of the jaw) is:
a. Cytomegalovirus b. human papilloma virus c. retroviruses d. Epstein- Barr virus e. Enterovirus

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