2. Herpesviruses acquire the viral spike glycoproteins as they bud out from modified nuclear membranes.

3. Gp120 of human immunodeficiency virus (HIV) promotes the fusion between the virus and its host cell.

4. Prions cause a disease called in Scrapie in sheep.

5. Herpesviruses code for their own DNA polymerase.

6. Hepatitis B virus replicates through RNA intermediate.

7. Poxviruses replicate entirely in the cytoplasm of the host cell.

8. RNA viruses utilize the host cell RNA-dependent RNA polymerase for replication.

9. Upon entry into host cells, rotaviruses do not fully un-coat in the cytoplasm of the infected host cell.

10. The ssRNA genome of HIV is reversely transcribed into cDNA in the host cell cytoplasm.

11. cDNA of HIV is integrated into host's cell genome using a viral-encoded protease.

12. For all RNA viruses, the assembly of capsid and genome occurs in the cytoplasm of host cells.

13. Rabies virus induces formation of Cowdry type A inclusion bodies.

14. The primary acute infection with Epstein-Barr virus (EBV) causes nasopharyngeal carcinoma in man.

15. Activated T helper 1 (Th1) cells cause lysis of recognized virus infected cells.

16. A recombinant virus is a result of phenotypic interaction between two types of viruses.

17. Genetic reassortment between influenza virus subtypes is the mechanism of antigenic shift in influenza A viruses.

18. Human immunodeficiency virus undergoes accumulation of genetic mutations which will eventually lead to the emergence of multiple new quasi-species of virus in the infected host.

19. Co-infection of a cell with 2 genetically defective viruses of the same species results in a phenotypically mixed progeny.

20. Complementation between 2 mutant viruses of the same type infecting the same cell is mediated by genetic recombination.