Viruses
Lesions on chorioallantoic membrane are produced by

all of these
Herpes simplex virus
Vaccinia virus
Herpes B virus

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Viruses
Which of the following statements is not true of viruses?

Viruses probably arose from small fragments of cellular chromosomes
All viruses are obligatory intracellular parasites
All viruses have either DNA or RNA as their genetic material
Viruses have been successfully grown in pure cultures in test tubes

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