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Microbiology Objective Questions { Viruses }



22. The capsomeres consist of a number of proteins subunits or molecules called
A.protomers
B.caproprotein
C.procapsid
D.none of these
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23. In order for a virus to replicate
A.the capsid must enter the host cell cytoplasm
B.the host cell must be undergoing mitosis
C.the genome must be released in the cytoplasm
D.the host cell must lack a cell membrane
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24. Which of the following viruses belong to family Flaviviridae?
A.Rubella virus
B.Yellow fever virus
C.Hepatitis C virus
D.All of these
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25. Which of the following viruses show/s transformation of infected cells?
A.Hepatitis B virus
B.Human T cell lymphotronic virus type I
C.Epstein-Barr virus
D.All of these
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26. Which of the following may affect proteins and nucleic acids, but not viruses?
A.Denaturation
B.Enzyme treatment
C.Pressure
D.All of these
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27. 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.none of these
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28. Which of the following statements is not true of viruses?
A.Viruses have been successfully grown in pure cultures in test tubes
B.All viruses are obligatory intracellular parasites
C.All viruses have either DNA or RNA as their genetic material
D.Viruses probably arose from small fragments of cellular chromosomes
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