Virus & Prion

2. the protein covering of a virus's nucleic acid core.
4. a lysogenized bacteriophage; a phage that is latently incorporated into the host chromosome instead of undergoing viral replication and lysis
5. in virus propagation methods, the clear zone of lysed cells in tissue culture chick embryo membrane that corresponds to area containing viruses.
6. the degenerative changes in cells associated with virus infections'
7. limitation imposed by the characteristics of the host cell on the type of virus that ca n successfully invade it.
10. the process whereby solid and liquid materials are taken into the cell through membrane invagination and engulfment into a vesicle
13. a bacterium acquires a new genetic trait due to the presence of genetic material from an infecting phage
14. a cytopathic protein associated with the slow-virus spongiform encephalopathies of humans and animals
15. the indefinite persistence of bacteriophage DNA in a host without bringing about the production of virions

1. a subunit of the virus capsid shaped as a triangle or disc
3. process whereby a bacteriophage in the prophage state is activated, begins replication, and enters the lytic cycle
8. an elementary virus particle in its complete morphological and thus infectious form. ____ consists of the nucleic acid core surrounded by capsid, which can be enclosed in an envelope
9. an infectious agent that, unlike a virion, lacks a capsid and consists of a closed circular RNA molecule. although known viroid are all plants pathogens, it is conceivable that animal versions exist
11. mammalian capable of causing malignant tumors
12. a multinucleated protoplasmic mass formed by consolidation of individual cells