15. West Nile virus can cause a disease in human beings that may be transmitted from an infected bird to a person by a mosquito. This is an example of
A.endogenous infection
B.fomite borne disease
C.arthropod borne disease
D.nosocomial infection

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16. What does the positive strand in double stranded RNA viruses stands for?
A.rRNA
B.tRNA
C.mRNA
D.None of these

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17. Which of the following characteristics would not be used to classify viruses?
A.Type of cell wall structure
B.Type of nucleic acid
C.Presence of an envelope
D.Symmetry

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18. Interanuclear inclusion bodies are found in cells infected with
A.Parvoviruses
B.Herpesviruses
C.Adenoviruses
D.all of these

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19. The reovirus and influenza virus contain
A.10 different segments of dsRNA and 8 different segments of ssRNA respectively
B.8 different segments of dsRNA and 10 different segments of ssRNA respectively
C.5 different segments of dsRNA and 7 different segments of ssRNA respectively
D.7 different segments of dsRNA and 5different segments of ssRNA respectively

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20. Which type of interferon is produced by T lymphocytes?
A.α
B.β
C.γ
D.γ and β

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21. Transfer of infection from cell to cell occurs mainly by direct transfer of virions via
A.plasmodesmata
B.cytodesmata
C.protodesmata
D.none of these

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