1. The most complex type of bacterial viruses having hexagonal head, a rigid tail with a contractile sheath and tall fibers is morphologically classified as

A. A
B. B
C. C
D. D

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2. Which of the following is not true of virions?

A. Reproduce independently
B. Contain DNA
C. Contain RNA
D. Are extracellular

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3. 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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4. 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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5. Which one is not useful in the treatment of viruses except

A. acyclovir
B. interferon
C. penicillin
D. antibodies

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