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

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

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

13. Enveloped viruses have a __________ shape.

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

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

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

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

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