11. Edward Jenner began inoculating humans with material from __________ lesions.

A. Smallpox
B. Avianpox
C. Cowpox
D. Chickenpox

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12. The viruses in an attenuated vaccine

A. have no genome
B. continue to replicate
C. are usually larger than bacteria
D. is altered with chemicals

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13. Enveloped viruses have a __________ shape.

A. icosahedral
B. helical
C. roughly spherical
D. complex

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14. The envelope of which of the following viruses is derived from the host cell nucleus?

A. Paramyxoviruses
B. Retroviruses
C. Orthomyxoviruses
D. Herpesviruses

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15. Which of the following is semi-continuous (diploid) cell line?

A. HeLa
B. HEp-2
C. WI-38
D. KB

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