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Microbiology Objective Questions { Viruses }



43. Bacteriophages have been used widely in genetic research, since they are the smallest and simplest biological entities capable of
A.self-replication
B.duplication
C.self-duplication
D.multiplication
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44. Lesions on chorioallantoic membrane are produced by
A.Herpes B virus
B.Vaccinia virus
C.Herpes simplex virus
D.all of these
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45. Which one is not useful in the treatment of viruses except
A.acyclovir
B.interferon
C.penicillin
D.antibodies
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46. The infected cells continue to reproduce themselves as well as the virus, and the mature virions are extruded from the cell surface continuously over a long period of time. This type of release mechanism is called a
A.productive infection
B.inductive infection
C.resultant infection
D.all of these
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47. What kind of embryo is often used for viral assays?
A.Mouse
B.Rat
C.Cat
D.Chicken
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48. The envelope of an enveloped virus is derived from
A.the mitochondrion of the cell
B.the cell membrane
C.the endoplasmic reticulum of the cell
D.none of these
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49. The most popular indirect method of counting virus particles is by
A.hemagglutination assay
B.plaque-assay
C.counting plaque-forming units
D.colony counting
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