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

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

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

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

4. Lesions on chorioallantoic membrane are produced by

A. Herpes B virus
B. Vaccinia virus
C. Herpes simplex virus
D. all of these

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

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